Classifications

• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C3/00—Glass compositions
  • C03C3/04—Glass compositions containing silica
  • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
  • C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B82—NANOTECHNOLOGY
  • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
  • B82Y40/00—Manufacture or treatment of nanostructures
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
  • C03B27/00—Tempering or quenching glass products
  • C03B27/012—Tempering or quenching glass products by heat treatment, e.g. for crystallisation; Heat treatment of glass products before tempering by cooling
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
  • C03B32/00—Thermal after-treatment of glass products not provided for in groups C03B19/00, C03B25/00 - C03B31/00 or C03B37/00, e.g. crystallisation, eliminating gas inclusions or other impurities; Hot-pressing vitrified, non-porous, shaped glass products
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
  • C03C10/0009—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing silica as main constituent
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
  • C03C10/0054—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing PbO, SnO2, B2O3
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C14/00—Glass compositions containing a non-glass component, e.g. compositions containing fibres, filaments, whiskers, platelets, or the like, dispersed in a glass matrix
  • C03C14/006—Glass compositions containing a non-glass component, e.g. compositions containing fibres, filaments, whiskers, platelets, or the like, dispersed in a glass matrix the non-glass component being in the form of microcrystallites, e.g. of optically or electrically active material
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C21/00—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C21/00—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface
  • C03C21/001—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions
  • C03C21/002—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions to perform ion-exchange between alkali ions
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C23/00—Other surface treatment of glass not in the form of fibres or filaments
  • C03C23/007—Other surface treatment of glass not in the form of fibres or filaments by thermal treatment
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C3/00—Glass compositions
  • C03C3/04—Glass compositions containing silica
  • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
  • C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
  • C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C3/00—Glass compositions
  • C03C3/04—Glass compositions containing silica
  • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
  • C03C3/095—Glass compositions containing silica with 40% to 90% silica, by weight containing rare earths
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C3/00—Glass compositions
  • C03C3/12—Silica-free oxide glass compositions
  • C03C3/122—Silica-free oxide glass compositions containing oxides of As, Sb, Bi, Mo, W, V, Te as glass formers
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C3/00—Glass compositions
  • C03C3/12—Silica-free oxide glass compositions
  • C03C3/14—Silica-free oxide glass compositions containing boron
  • C03C3/15—Silica-free oxide glass compositions containing boron containing rare earths
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C4/00—Compositions for glass with special properties
  • C03C4/0028—Compositions for glass with special properties for crystal glass, e.g. lead-free crystal glass
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C4/00—Compositions for glass with special properties
  • C03C4/04—Compositions for glass with special properties for photosensitive glass
  • C03C4/06—Compositions for glass with special properties for photosensitive glass for phototropic or photochromic glass
  • C03C4/065—Compositions for glass with special properties for photosensitive glass for phototropic or photochromic glass for silver-halide free photochromic glass
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C4/00—Compositions for glass with special properties
  • C03C4/08—Compositions for glass with special properties for glass selectively absorbing radiation of specified wave lengths
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C4/00—Compositions for glass with special properties
  • C03C4/08—Compositions for glass with special properties for glass selectively absorbing radiation of specified wave lengths
  • C03C4/082—Compositions for glass with special properties for glass selectively absorbing radiation of specified wave lengths for infrared absorbing glass
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C4/00—Compositions for glass with special properties
  • C03C4/08—Compositions for glass with special properties for glass selectively absorbing radiation of specified wave lengths
  • C03C4/085—Compositions for glass with special properties for glass selectively absorbing radiation of specified wave lengths for ultraviolet absorbing glass
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B5/00—Optical elements other than lenses
  • G02B5/20—Filters
  • G02B5/208—Filters for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
  • C03C10/0018—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing SiO2, Al2O3 and monovalent metal oxide as main constituents
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
  • C03C10/0018—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing SiO2, Al2O3 and monovalent metal oxide as main constituents
  • C03C10/0027—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing SiO2, Al2O3 and monovalent metal oxide as main constituents containing SiO2, Al2O3, Li2O as main constituents
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C2204/00—Glasses, glazes or enamels with special properties
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C4/00—Compositions for glass with special properties
  • C03C4/18—Compositions for glass with special properties for ion-sensitive glass

Definitions

• the disclosure relates to glass ceramic materials. More particularly, the disclosure relates to optically transparent glass ceramic materials. Even more particularly, the disclosure relates to optically transparent glass ceramic materials having a crystalline tungsten bronze phase.
• NIR-shielding glasses are being developed to block and/or eliminate wavelengths ranging from 700-2500 nm for applications ranging from optical filters, lenses, and glazing for medical, defense, aerospace, and consumer applications.
• Low emittance (low-E) coatings have been developed to minimize the amount of ultraviolet and infrared light that can pass through glass without compromising the amount of visible light that is transmitted.
• Low-E coatings are typically either sputtered or pyrolytic coatings.
• low-E plastic laminates may be retrofitted to a glass substrate.
• tungsten bronzes thin films, coatings, and composite materials containing nano- or micron- sized particles of non-stoichiometric tungsten suboxides or doped non- stoichiometric tungsten trioxides (referred to as tungsten bronzes) have been used to provide near infrared shielding with high transparency in the visible spectrum.
• tungsten bronze films often require expensive vacuum deposition chambers, have limited mechanical robustness, and are susceptible to oxygen, moisture, and UV light, all of which cause the NIR shielding performance of these materials to decrease and to discolor and degrade transparency in the visible light range.
• the present disclosure provides optically transparent glass ceramic materials which, in some embodiments, comprise a glass phase containing at least about 80% silica by weight and a crystalline tungsten bronze phase having the formula M X W0 3 , where M includes, but is not limited to, at least one of H, Li, Na, K, Rb, Cs, Ca, Sr, Ba, Zn, Cu, Ag, Sn, Cd, In, Tl, Pb, Bi, Th, La, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, Lu, and U, and where 0 ⁇ x ⁇ 1.
• the crystalline tungsten bronze phase comprises nanoparticles.
• the glass ceramic in some embodiments, has a low coefficient of thermal expansion (CTE), strong attenuation or blocking of ultraviolet (UV) radiation at wavelengths of less than about 360 nm and near infrared (NIR) radiation at wavelengths ranging from about 700 nm to about 3000 nm.
• CTE coefficient of thermal expansion
• UV radiation ultraviolet
• NIR near infrared
• Alumino silicate and zinc-bismuth-borate glasses comprising at least one of Srr ⁇ C , ⁇ 2(3 ⁇ 4, and E ⁇ C are also provided.
• one aspect of the disclosure is to provide a glass ceramic comprising a silicate glass phase and from about 1 mol% to about 10 mol% of a crystalline M X W0 3 phase comprising nanoparticles, where M is at least one of H, Li, Na, K, Rb, Cs, Ca, Sr, Ba, Zn, Cu, Ag, Sn, Cd, In, Tl, Pb, Bi, Th, La, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, Lu, and U, and where 0 ⁇ x ⁇ 1.
• a second aspect of the disclosure is to provide a glass ceramic comprising a silicate glass phase and from about 1 mol% to about 10 mol% of a crystalline M X W0 3 phase comprising nanoparticles, where M is at least one alkali metal, and 0 ⁇ x ⁇ 1.
• an alumino silicate glass comprising Si02, A1203, and at least one of Srr ⁇ C , P ⁇ C , and E ⁇ C , where Srr ⁇ C + P ⁇ C + E ⁇ C ⁇ 12 mol%.
• the aluminosilicate glass in some embodiments, further comprises at least one alkaline earth oxide and B2O 3 .
• the glasses in some embodiments, have less than about 30% transmission at a wavelength between about 1400 nm and about 1600 nm.
• a zinc-bismuth-b orate glass comprising ZnO,
• the Zn-Bi-borate glasses further comprise at least one of Na 2 0 and Te0 2 . These glasses, in some embodiments, have less than about 30% transmission at a wavelength between about 1400 nm and about 1600 nm.
• FIGURE 1 is a plot of absorbance vs. wavelength of splat-quenched, annealed, and heat-treated glass ceramic samples
• FIGURE 2 is a plot of spectra of splat-quenched (A), annealed (B), and heat-treated (C) glass ceramic compositions;
• FIGURE 3 is a plot of differential scanning calorimetry cooling curves measured for glass ceramic samples
• FIGURE 4 is a plot of spectra of glass ceramics containing different alkali tungsten bronzes
• FIGURE 5 is an x-ray powder diffraction profile of a splat-quenched glass ceramic
• FIGURE 6 is an x-ray powder diffraction profile of a heat-treated glass ceramic
• FIGURE 7 is a flow chart for a method of infiltrating a glass to form a glass ceramic
• FIGURE 8 is a plot of a dispersion curve for glass E listed in Table E;
• FIGURE 9 is a plot of transmission for glass E listed in Table E; and [0021] FIGURE 10 is a plot of transmission for glasses J
• glass article and “glass articles” are used in their broadest sense to include any object made wholly or partly of glass and/or glass ceramics, and includes laminates of the glasses and glass ceramics described herein with conventional glasses. Unless otherwise specified, all compositions are expressed in terms of mole percent (mol%). Coefficients of thermal expansion (CTE) are expressed in terms of 10 "7 /°C and represent a value measured over a temperature range from about 20°C to about 300°C, unless otherwise specified.
• CTE coefficients of thermal expansion
• nanop article and “nanop articles” refer to particles between about 1 and about 1,000 nanometers (nm) in size.
• platelet and “platelets” refer to flat or planar crystals.
• nanorod and “nanorods” refer to elongated crystals having a length of up to about 1 ,000 nm and an aspect ratio (length/ width) of at least 3 and in some embodiments, in a range from about 3 to about 5.
• transmission and transmittance refer to external transmission or transmittance, which takes absorption, scattering and reflection into consideration. Fresnel reflection is not subtracted out of the transmission and transmittance values reported herein.
• a glass that is "free of MgO” is one in which MgO is not actively added or batched into the glass, but may be present in very small amounts (e.g., less than 400 parts per million (ppm), or less than 300 ppm) as a contaminant.
• Compressive stress and depth of layer are measured using those means known in the art.
• Such means include, but are not limited to, measurement of surface stress (FSM) using commercially available instruments such as the FSM-6000, manufactured by Orihara Co., Ltd. (Tokyo, Japan).
• FSM surface stress
• FSM-6000 manufactured by Orihara Co., Ltd. (Tokyo, Japan).
• SOC stress optical coefficient
• ASTM standard C770-98 (2013) entitled “Standard Test Method for Measurement of Glass Stress-Optical Coefficient,” the contents of which are incorporated herein by reference in their entirety.
• the modification of Procedure C includes using a glass disc as the specimen having a thickness of 5 to 10 mm and a diameter of 12.7 mm.
• the disc is isotropic and homogeneous, and is core-drilled with both faces polished and parallel.
• the modification also includes calculating the maximum force, Fmax to be applied to the disc.
• the force should be sufficient to produce at least 20 MPa compression stress.
• Fmax is calculated using the equation:
• Fmax maximum force, expressed in Newtons
• D is the diameter of the disc, expressed in millimeters (mm)
• h is the thickness of the light path, also expressed in mm.
• F is the force, expressed in Newtons
• D is the diameter of the disc, expressed in millimeters (mm)
• h is the thickness of the light path, also expressed in millimeters.
• FSM DOL refers to the depth of the compressive layer as determined by surface stress measurements (FSM) measurements using commercially available instruments such as, but not limited to, the FSM-6000 stress meter.
• the depth of compression DOC refers to the depth at which the stress is effectively zero inside the glass and can be determined from the stress profile obtained using the refractive near field (RNF) and polarimetric methods that are known in the art. This DOC is typically less than the FSM DOL measured by the FSM instrument for a single ion exchange process.
• the FSM technique may suffer from contrast issues that affect the observed DOL value. At deeper depths of compressive layer, there may be inadequate contrast between the TE and TM spectra, thus making the calculation of the difference between the spectra of bound optical modes for TM and TE polarization - and accurate determination the DOL - more difficult.
• the FSM software analysis is incapable of determining the compressive stress profile (i.e., the variation of compressive stress as a function of depth within the glass).
• the FSM technique is incapable of determining the depth of layer resulting from the ion exchange of certain elements in the glass such as, for example, the ion exchange of sodium for lithium.
• the DOL as determined by the FSM is a relatively good approximation for the depth of the compressive layer of depth compression (DOC) when the DOL is a small fraction r of the thickness t and the index profile has a depth distribution that is reasonably well approximated with a simple linear truncated profile.
• DOC compressive layer of depth compression
• the compressive stress, stress profile, and depth of layer may be determined using scattered linear polariscope (SCALP) techniques that are known in the art.
• SCALP scattered linear polariscope
• the SCALP technique enables non-destructive measurement of surface stress and depth of layer.
• optically transparent glass ceramic materials which, in some embodiments, comprise a glass phase containing at least about 90% silica by weight and a crystalline tungsten bronze phase.
• These glass ceramics comprise a silicate glass phase and from about 0.1 mol% to about 10 mol%, or from about 1 mol% to about 4 mol%, or from about 0.5 mol% to about 5 mol% of a crystalline tungsten bronze phase comprising crystalline M X W03 nanoparticles.
• the crystalline M X W03 nanoparticles are encapsulated within and dispersed within and, in some embodiments, throughout the residual glass phase.
• the M X W03 crystalline nanoparticles are disposed at or near the surface of the glass ceramic.
• the M X W03 crystalline nanoparticles are platelet-shaped and have an average diameter, determined by those means known in the art (e.g., SEM and/or TEM microscopy, x-ray diffraction, light scattering, centrifugal methods, etc.) ranging from about 10 nm to 1000 nm, or from about 10 nm to about 5 ⁇ , and/or M X W03 nanorods having a high aspect ratio and an average length, determined by those means known in the art, ranging from 10 nm to 1000 nm, and an average width, determined by those means known in the art, ranging from about 2 to about 75 nm.
• tungsten bronze glass ceramics that exhibit high visible transparency and strong UV and NIR absorption contain high aspect ratio (length/width) M X W0 3 rods having an average length ranging from about 10 nm to about 200 nm and an average width ranging from about 2 nm to 30 nm.
• the crystalline tungsten bronze phase has the formula MxWC , where M is at least one of H, Li, Na, K, Rb, Cs, Ca, Sr, Ba, Zn, Cu, Ag, Sn, Cd, In, Tl, Pb, Bi, Th, La, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, Lu, and U, and where 0 ⁇ x ⁇ 1.
• These glass ceramics have a low coefficient of thermal expansion (CTE), strong attenuation or blocking of ultraviolet (UV) radiation at wavelengths of less than about 250 nm and near infrared (NIR) radiation at wavelengths ranging from about 700 nm to about 2500 nm.
• CTE coefficient of thermal expansion
• UV radiation ultraviolet
• NIR radiation near infrared
• the glass ceramics described herein are optically transparent in the visible (i.e., wavelengths from about 400 nm to about 700 nm) region of the spectrum. That is, the glass ceramic has a transmittance of greater than about 1% over a 1 mm path length (expressed herein as "%/mm") over at least one 50 nm-wide wavelength band of light in a range from about 400 nm to about 700 nm.
• the glass ceramic has a transmittance of at least greater than about 10%/mm, in some embodiments greater than about 30%/mm, in other embodiments, greater than about 50%/mm (e.g., >75%/mm, >80%/mm, >90%/mm over at least one 50 nm-wide wavelength band of light in the visible region of the spectrum.
• these glass ceramics absorb light in the ultraviolet (UV) region (wavelengths of less than about 370 nm) and near infrared (NIR) region (from greater than about 700 nm to about 1700 nm) of the spectrum without use of coatings or films, which are mechanically fragile and sensitive to UV light and moisture.
• UV ultraviolet
• NIR near infrared
• the glass ceramic has a transmittance of less than 10%/mm, or even less than 5 %/mm and, in other embodiments, less than 2%/mm or even less than 1%/mm for light having a wavelength of about 370 nm or less (e.g., at 370 nm wavelength). In some embodiments, for light having a wavelength of about 370 nm or less, the glass ceramic absorbs or has an absorption of at least 90%/mm, in other embodiments, at least 95%/mm, and in other embodiments at least 98 %, or even at least 99%/mm at this wavelength (e.g., at 370 nm wavelength).
• the glass ceramic has a transmittance of less than 10%/mm and, in other embodiments, less than 5%/mm over at least one 50 nm-wide wavelength band of light for light in the NIR region (i.e., from about 700 nm to about 2500 nm) of the spectrum. In some embodiments, the glass ceramic absorbs at least 90%/mm and, in other embodiments, at least 95%/mm over at least one 50 nm-wide wavelength band of light for light in the NIR region (i.e., from about 700 nm to about 2500 nm) of the spectrum.
• the glass ceramics described herein are capable of withstanding temperatures of at least about 300°C, or, in some embodiments, at least about 200°C, without impairing their optical or mechanical properties.
• the transmittance of the glass ceramic between about 500 nm and about 2500 nm changes by less than 10%/mm when the glass ceramic is heated at temperatures in a range from about 200°C to about 300°C for periods of at least one hour.
• These glass ceramics are, in some embodiments, unreactive and otherwise impervious to oxygen, hydrogen, and moisture.
• the glass ceramics described herein have a coefficient of thermal expansion (CTE) at temperatures ranging from about 0°C to about 300°C of about 75 x 10 "7 °C _1 . In some embodiments, the glass ceramics have a coefficient of thermal expansion (CTE) at temperatures ranging from about 0°C to about 300°C from about 33.5 x l O ' ⁇ C "1 to about 66.3 x lO ' ⁇ C "1 (e.g., samples 2, 1 1, 12, 13, and 54 in Table 1).
• CTE coefficient of thermal expansion
• the glass ceramics described herein are bleachable - i.e., the crystalline MxWC may be "erased" by thermally treating the glasses/glass ceramics for a short period above their respective softening points. Such thermal treatment may be performed using those energy sources known in the art, such as, but not limited to, resistance furnaces, lasers, microwaves, or the like.
• Composition 37 (Table 1), for example, may be bleached by holding the material at a temperature between about 685 °C and about 740°C for approximately 5 minutes.
• the MxWCh bronze phase may then be re-formed or re-crystallized on the surface of the material by exposure to a UV-pulsed laser; i.e., the tungsten bronze phase will be reformed in those areas exposed to the laser.
• the glass ceramics described herein may be used for low-emittance glazing in architectural, automotive, medical, aerospace, or other applications, including thermal face shields, medical eyewear, optical filters, and the like.
• the glass ceramic forms a portion of a consumer electronic product, such as a cellular phone or smart phone, laptop computer, tablet, or the like.
• consumer electronic products typically comprise a housing having front, back, and side surfaces, and includes electrical components, which are at least partially internal to the housing.
• the electrical components include at least a power source, a controller, a memory, and a display.
• the glass ceramic described herein comprises at least a portion of a protective element, such as, but not limited to, the housing and/or display.
• the glass phase is a borosilicate glass and the glass ceramic comprises S1O2, AI2O 3 , B2O 3 , WO 3 , and at least one alkali metal oxide R2O, where R2O is at least one of Na20, K 2 0, CS2O, and/or Rb20, and the crystalline tungsten bronze phase is an tungsten bronze solid solution containing, comprising, or consisting essentially of MWO3, where M is at least one of Na20, K2O, CS2O, and Rb20.
• the glass ceramic comprises: from about 56 mol% to about 78 mol% S1O2 (56 mol% ⁇ S1O2 ⁇ 78 mol%) or from about 60 mol% to about 78 mol% Si0 2 (60 mol% ⁇ Si0 2 ⁇ 78 mol%); from about 8 mol% to about 27 mol% B 2 0 3 (8 mol% ⁇ B 2 0 3 ⁇ 27 mol%); from about 0.5 mol% to about 14 mol% AI2O 3 (0.5 mol% ⁇ AI2O 3 ⁇ 14 mol%); from greater than 0 mol% to about 10 mol% of at least one of Na 2 0, K 2 0, Cs 2 0, and Rb 2 0 (0 mol% ⁇ Na 2 0 + K 2 0 + Cs 2 0 + Rb 2 0 ⁇ 9 mol%); from about 1 mol% to about 10 mol% W0 3 (1 mol% ⁇ W0 3 ⁇ 10 mol%) or, in some embodiments, from about
• the glass ceramic may comprise from 0 mol% to about 9 mol% Li 2 0; in some embodiments, from 0 mol% to about 9 mol% Na 2 0 (0 mol% ⁇ Na 2 0 ⁇ 9 mol%); in some embodiments, from 0 mol% to about 9 mol% K 2 0 (0 mol% ⁇ K 2 0 ⁇ 9 mol%) or from 0 mol% to about 3 mol% K 2 0 (0 mol% ⁇ K 2 0 ⁇ 3 mol%); in some embodiments, from 0 mol% to about 10 mol% Cs 2 0 (0 mol% ⁇ Cs 2 0 ⁇ 10 mol%) or from greater than 0 mol% to about 7 mol% Cs 2 0 (0 mol% ⁇ Cs 2 0 ⁇ 7 mol%); and/or, in some embodiments, from 0 mol% to about 9 mol% Rb 2 0 (0 mol% ⁇ Rb 2 0 ⁇ 9 mol%).
• the glass ceramic may further comprise at least one of: up to about 0.5 mol% MgO (0 mol% ⁇ MgO ⁇ 0.5 mol%); up to about 2 mol% P2O5 (0 mol% ⁇ P2O5 ⁇ 2 mol%); and up to about 1 mol% (0 mol% ⁇ ZnO ⁇ 1 mol%).
• the rate of formation of MxWC upon cooling or heat treatment may be increased by the addition of at least one of MgO (e.g., samples 55, 56, and 57 in Table 1), P2O5. (e.g., sample 58 in Table 1), and ZnO up (e.g., sample 59 in Table 1).
• compositions of glass ceramics that are transparent in the visible light range and UV and NIR-absorbing are listed in Table 1. Compositions that do not absorb either UV or NIR radiation are listed in Table 2.
• Table 1 Compositions of glass ceramics that are optically transparent in the visible light range and absorbing in the UV and NIR light ranges.
• Table 2 Compositions of glass ceramics that do not absorb radiation in the UV and NIR light ranges.
• peraluminous melts refer to melts in which the molar proportion or content of alumina that is greater than that of R2O, where R2O is at least one of Li 2 0, Na 2 0, K 2 0, and Cs 2 0; i.e. Al 2 0 3 (mol%) > R 2 0(mol%).
• the first sub-category is one in which peraluminous melts, when quenched rapidly from the molten state and after annealing, are transparent in the visible wavelength range and NIR regime (e.g., samples 12, 15-17, 20, 23, 25, 33, 35- 42, 44, 46, 47, and 48 in Table 1). These materials require a subsequent heat treatment at or slightly above the anneal temperature but below the softening point in order to develop the NIR- absorbing nanocrystalline MxWC phase.
• FIG. 1 is a plot of absorbance vs. wavelength for splat-quenched, annealed, and heat-treated samples of composition 13.
• splat-quenching refers to the process of pouring a small amount or "glob" of molten glass onto an iron plate that is at room temperature and immediately pressing the glob with an iron plunger (also at room temperature) so as to rapidly cool the glass and press the glob into a thin (3-6 mm) disc of glass. While the splat-quenched (A in FIG.
• composition/sample 13 shows no absorption in the visible or NIR regimes, those samples that have been heat treated (C, D, E) exhibit absorbance in the NIR regime that increases with increasing heat treatment time, as well as some visible light attenuation at wavelengths in the 600-700 nm range, resulting in a material having a blue hue.
• the second category of peraluminous melts remains transparent in the visible and NIR regimes if rapidly quenched, but exhibits NIR absorption post annealing (see samples 12, 14, 19, 21, 22, 24, and 26-32 in Table 1).
• FIG. 2 which shows spectra of splat-quenched (A), annealed (B), and heat-treated (C) samples of glass ceramic composition 11, the NIR absorbance of the splat-quenched or annealed glass ceramic may be enhanced by further heat treatment.
• the third category of peraluminous melts exhibits NIR absorption even upon rapid quenching (see samples 1 and 7 in Table 1).
• the NIR absorption of these materials may be further enhanced by subsequent heat treatment at or above the annealing point, but below the softening point.
• NIR absorption may be further enhanced by subsequent heat treatment at or above the annealing point, but below the softening point.
• the rate of formation of the crystalline M x W0 3 phase may also be tuned by adjusting at least one of heat treatment time and temperature; the (R 2 0(mol%) +Al 2 03(mol%))AV03(mol%) ratio; the R 2 0(mol%)AV0 3 (mol%) ratio; the Al 2 0 3 (mol%)AV0 3 (mol%) ratio; and selection of alkali (or alkalis) to be batched.
• more of the crystalline M x W0 3 phase precipitates with longer heat treatment times, resulting in a material having stronger NIR absorption.
• excessive heat treatment times may cause the crystalline M x W0 3 phase to coarsen.
• coarsening may be accompanied by formation of a secondary or tertiary crystalline phase such as borastalite or aluminum borate.
• the formation of these secondary phases may produce a material that scatters visible wavelengths of light and thus appears hazy or opalescent.
• the rate of M X W03 formation in most instances increases as the heat treatment temperature increases and approaches the softening point of the glass.
• the ratio R 2 0(mol%)/W03(mol%) is greater than or equal to 0 and less than or equal to about 4 (0 ⁇ R 2 0(mol%)/W0 3 (mol%) ⁇ 4), and the ratio Al 2 03(mol%)/W03(mol%) is in a range from about 0.66 and about 6 (0.66 ⁇ Al 2 03(mol%)AV0 3 (mol%) ⁇ 6).
• R 2 0(mol%)AV0 3 (mol%) is greater than 4 (R 2 0(mol%)/W03(mol%) > 4)
• the glasses may precipitate a dense immiscible second phase and separate, resulting in an inhomogeneous melt.
• the glasses cease to precipitate the crystalline M X W03 NIR-absorbing phase.
• the R 2 0(mol%)/W03(mol%) ratio is in a range from about 0 to about 3.5 (0 ⁇ R 2 0/W03 ⁇ 3.5) (e.g., sample 26 in Table 1).
• R 2 0/W03 is in a range from about 1.25 and about 3.5 (1.25 ⁇ R 2 0(mol%)/W03(mol%) ⁇ 3.5) (e.g., sample 53 in Table 1), as samples in this compositional range rapidly precipitate the UV and NIR absorbing M X W03 crystalline phase, exhibit high visible transparency with strong NIR absorption, and are bleachable (i.e., the M X W03 crystalline phase can be "erased").
• the ratio Al 2 03(mol%)/W03(mol%) is, in certain embodiments, is in a range from about 0.66 and about 4.5 (0.66 ⁇ Al 2 03(mol%)/W0 3 (mol%) ⁇ 4.5) (e.g., sample 40 in Table 1), and, most preferably, Al 2 03(mol%)/W03(mol%) is is in a range from about 2 to about 3 (1 ⁇ Al 2 03(mol%)AV03(mol%) ⁇ 3) (e.g., sample 61 in Table 1). Above this range, the NIR absorbing nano crystalline MxWC bronze forms slowly.
• DSC differential scanning calorimetry
• the peak or maximum transmission wavelength in the visible range and NIR absorption edge of the glass ceramic may be tuned through composition, heat treatment time and temperature, and alkali metal oxide selection.
• Spectra of glass ceramics containing different alkali tungsten bronzes and otherwise having identical compositions are shown in FIG. 4.
• the potassium and cesium analogs (samples 16 and 13, respectively) and have shorter peak visible transmittance wavelengths (440-450 nm) than the sodium and lithium analogs (samples 15 and 14, respectively), which have peak visible transmittance wavelengths of 460 nm and 510 nm, respectively.
• the glass ceramics described herein have a lower boron concentration - i.e., from about 9.8 mol% to about 11.4 mol% B 2 0 3 (9.8 mol% ⁇ B 2 0 3 ⁇ 11.4 mol%).
• the NIR-absorbing crystalline M X W0 3 phase is precipitated over a narrow and low temperature range, as shown in Table B.
• These compositions may be heated above their respective softening points and sagged, slumped, or formed, without growing the crystalline MxWC phase.
• composition 44 can be bleached by holding the material at a temperature between about 685°C and about 740°C for approximately 5 minutes.
• Table B Crystallization temperature ranges for crystalline M X W03 phases in samples having low B2O 3 content.
• these glasses and glass ceramics may be patterned with UV lasers.
• the M X W0 3 phase may be precipitated in rapidly quenched compositions (e.g., sample 14 in Table 1), for example, by exposing the material exposed to a 10 watt 355 nm pulsed laser.
• Table C lists physical properties, including strain, anneal and softening points, coefficients of thermal expansion (CTE), density, refractive indices, Poisson's ratio, shear modulus, Young's modulus, liquidus (maximum crystallization) temperature, and the stress optical coefficient (SOC) measured for selected sample compositions listed in Table 1.
• CTE coefficients of thermal expansion
• CTE coefficients of thermal expansion
• refractive indices density
• Poisson's ratio density
• shear modulus Young's modulus
• liquidus maximum crystallization temperature
• SOC stress optical coefficient
• Table C Physical properties measured for glass ceramics having compositions selected from Table 1.
• the glass ceramic comprises alumina
• the glass ceramic may be ion exchangeable.
• Ion exchange is commonly used to chemically strengthen glasses.
• alkali cations within a source of such cations e.g., a molten salt, or "ion exchange,” bath
• CS compressive stress
• DOL depth of layer
• DOC depth of compression DOC
• the glass ceramic is ion exchanged and has a compressive layer extending from at least one surface to a depth (as indicated by DOC and/or DOL) of at least about 10 ⁇ within the glass ceramic.
• the compressive layer has a compressive stress CS of at least about 100 MPa and less than about 1500 MPa at the surface.
• compositions 51 and 54 were ion exchanged.
• the samples were first heat-treated at 550°C for 15 hours, then cooled at l°C/min to 475 °C, and further cooled to room temperature at the rate of cooling of the furnace when power is shut off (furnace rate).
• the cerammed samples were then ion exchanged at 390°C for 3 hours in a molten bath of K O3 resulting in surface compressive stresses of 360 MPa and 380 MPa and depths of layers of 31 and 34 microns for glass-ceramic compositions 51 and 54, respectively.
• the glass ceramics described herein may be made using a melt quench process. Appropriate ratios of the constituents may be mixed and blended by turbulent mixing or ball milling. The batched material is then melted at temperatures ranging from about 1550°C to about 1650°C and held at temperature for times ranging from about 6 to about 12 hours, after which time it may be cast or formed and then annealed. Depending on the composition of the material, additional heat treatments at or slightly above the annealing point, but below the softening point, to develop the crystalline M X W03 second phase and provide UV- and NIR-absorbing properties.
• Table D Heat Treatment temperature and time ranges used to produce UV- and NIR- absorbing M X W03 glass ceramics via the melt-quench process. Composition Heat Treatment Heat Treatment Time
• the glass ceramic is formed by infiltrating a nano-porous glass such as, but not limited to, VYCOR®, a high-silica glass manufactured by Corning Incorporated.
• a nano-porous glass such as, but not limited to, VYCOR®, a high-silica glass manufactured by Corning Incorporated.
• Such nano-porous glasses may be 20 to 30% porous with a 4.5-16.5 nm average pore diameter, with a narrow pore size distribution (with about 96% of the pores in the glass being +0.6 nm from the average diameter).
• the average pore diameter may be increased to about 16.5 nm by adjusting the heat treatment schedule required to phase separate the glass and by modifying etching conditions.
• FIG. 7 A flow chart for the method of infiltrating a glass and forming the glass ceramic is shown in FIG. 7.
• a first solution containing tungsten, a second solution containing the metal cation M, and a third solution of boric acid are prepared or provided to deliver these components to a nano-porous glass substrate.
• the tungsten solution is prepared by dissolving ammonium metatungstate (AMT) in deionized water to produce a desired concentration of tungsten ions.
• AMT ammonium metatungstate
• organic precursors such as tungsten carbonyl, tungsten hexachloride, or the like may be used to deliver the tungsten into the pores of the nano-porous glass substrate.
• a number of aqueous precursors including nitrates, sulfates, carbonates, chlorides, or the like may also be used to provide the metal M cation in the M X W0 3 bronze.
• a first aqueous solution of 0.068 M AMT and a second aqueous solution 0.272 M of cesium nitrate are prepared or provided such that the cesium cation concentration is 1/3 of the tungsten cation concentration.
• the third solution is a super-saturated boric acid solution which, in some embodiments, may be prepared by adding boric acid hydrate to deionized water, and heating the mixture to boiling while stirring.
• the nano-porous glass may be cleaned prior to forming the glass ceramic.
• Samples e.g., 1 mm sheets
• Samples may first be slowly heated in ambient air to a temperature of about 550°C to remove moisture and organic contaminants, and subsequently kept stored at about 150°C until ready for use.
• the nano-porous glass is first infiltrated with the tungsten solution
• step 120 by immersing the glass in the first, tungsten-containing solution at room temperature (about 25 °C).
• the nano-porous glass is immersed in the first solution for about one hour.
• the glass sample may then be removed from the first solution, soaked for about one minute in deionized water, and dried in ambient air for times ranging from about 24 to about 72 hours.
• the infiltrated nano-porous glass sample is heated in flowing oxygen to decompose the ammonium tungsten metatungstate and form WO 3 (step 130).
• the glass is first heated to about 225°C at a rate of about l°C/minute, then heated from about 225°C to about 450°C at a rate of 2.5°C/minute followed by a four hour hold at 450°C, and then cooled from about 450°C to room temperature at a rate in a range from about 5°C to about 7°C per minute.
• Step 130 may, in some embodiments, include pre-heating the glass at about 80°C for up to about 24 hours prior to the above heat treatment.
• step 130 the glass is immersed in the second solution (step 2).
• Step 140 at room temperature (about 25°C) to infiltrate the glass with the M cation solution.
• Step 140 may, in some embodiments, be preceded by pre-heating the glass at about 80°C for up to about 24 hours prior to immersion.
• the nano-porous glass is immersed in the second solution for about one hour.
• the glass sample may then be removed from the second solution, soaked for about one minute in deionized water, and dried in ambient air for times ranging from about 24 to about 72 hours.
• the nano-porous glass sample is heated to form the crystalline tungsten bronze M X W0 3 phase (step 150).
• Heating step 150 includes first heating the glass from about 5°C to about 200°C at a rate (ramp rate) of about l°C/minute in a nitrogen atmosphere, followed by heating from about 200°C to about 575°C at a rate of about 3°C/minute under an atmosphere of 3% hydrogen and 97% nitrogen and a one hour hold at 575°C, and then rapidly cooling the glass to about 300°C by opening the furnace in which the heating step takes place.
• the sample is then left to stand in ambient air for an unspecified time.
• the glass sample is immersed in the third solution, which is a supersaturated boric acid solution (step 160).
• the third solution is maintained at boiling and gently stirred during step 160.
• the glass sample is immersed in the boiling solution for about 30 minutes.
• the sample is washed with deionized water and left to stand in ambient air for about 24 hours.
• the glass is then heated under a nitrogen atmosphere to form and consolidate the glass ceramic (step 170).
• the glass is first heated from room temperature to about 225°C at a ramp rate of about l°C/minute in step 170, followed by heating from about 225°C to about 800°C at a rate of about 5°C/minute.
• the glass is held at 800°C for about one hour and then cooled from about 800°C to room temperature at a rate of about 10°C/minute.
• glasses doped with rare earth oxides and having high absorbance in the NIR region of the spectrum are provided.
• these glasses contribute to high refractive index of the glass in the in the IR.
• the rare earth oxide dopants which include Sm 2 0 3 , Pr 2 0 3 , and Er 2 0 3 , comprise up to about 12 mol% of the glass.
• the REO-doped glasses are aluminosilicate glasses comprising AI2O3 and S1O2 and at least one of Srr ⁇ C , P ⁇ C , and E ⁇ C , where Sm 2 0 3 + Pr 2 0 3 + Er 2 0 3 ⁇ 12 mol%.
• the glasses further comprise at least one alkaline earth oxide and B2O 3 .
• the glasses in some embodiments, have less than about 30% transmission at a wavelength between about 1400 nm and about 1600 nm.
• Non-limiting examples of compositions of aluminosilicate glasses are listed in Table E. Refractive indices (RI) measured for these glasses are also listed in Table E. Glasses A, B and C, which contain no alkaline earth modifiers, were too viscous to pour, even at 1650°C. Glasses E and F, which contain appreciable amounts (> 21 mol%) of alkaline earth modifiers, as well as B2O 3 could pour readily at 1650°C.
• Dispersion and percent transmittance for Glass E for both the visible and NIR regions of the spectrum are plotted in FIGS. 8 and 9, respectively.
• Glass E exhibits both a high refractive index in the infrared (IR) region and high absorbance at 1550 nm.
• UV-VIS-IR spectra of these compositions containing 3-5 mol%% Pr 2 0 3 are plotted in FIG. 10, and show the high absorbance of these glasses at 1550 nm.
• Table E Compositions of rare earth-doped aluminosilicate glasses.
• the REO-doped glasses are zinc-bismuth-borate glasses comprising ZnO, B12O 3 , B2O 3 and at least one of Sm 2 0 3 , Pr 2 0 3 , and ⁇ 2 (3 ⁇ 4, where Sm 2 0 3 + ⁇ 2 (3 ⁇ 4 + Er 2 0 3 ⁇ 12 mol%.
• the REO-doped Zn-Bi-borate glasses further comprise at least one of Na20 and Te02. The glasses, in some embodiments, have less than about 30% transmission at a wavelength between about 1400 nm and about 1600 nm.
• Non-limiting examples of compositions of Zn- Bi-borate glasses are listed in Table F. Refractive indices (RI) measured for these glasses are also listed in Table F.
• Table F Compositions of rare earth-doped Zn-Bi-borate glasses.

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