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
  • C03C3/32—Non-oxide glass compositions, e.g. binary or ternary halides, sulfides or nitrides of germanium, selenium or tellurium
  • C03C3/321—Chalcogenide glasses, e.g. containing S, Se, Te
  • C03C3/323—Chalcogenide glasses, e.g. containing S, Se, Te containing halogen, e.g. chalcohalide glasses
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S501/00—Compositions: ceramic
  • Y10S501/90—Optical glass, e.g. silent on refractive index and/or ABBE number
  • Y10S501/904—Infrared transmitting or absorbing

Definitions

• Verre_s_à_ b_as_e_ 'halogénur_es_ de_tellure et de selenium their preparation and their application.
• the present invention relates to new glasses based on tellurium halide, their preparation and their application in particular in the field of infrared transmission.
• the glasses of the invention are less brittle than glasses based on tellurium halide and selenium. They also have the advantage of making it possible to obtain solid parts by hot pressing, when the glass is in its plasticity zone, at a temperature a few tens of degrees higher than the glass transition temperature. These glasses can thus be shaped, by moderate pressure, in pyrex glass enclosures. It can be seen that the glasses of the invention, thus shaped, are capable of duplicating the polished surface of the pyrex mold, so that subsequently the polishing of the part obtained is not necessary, which allows to considerably reduce the cost prices.
• the glasses of the invention can be deposited in thin layers to obtain anti-reflective deposits or integrated optics. They also allow easy production of double index preforms for the production of optical fibers.
• the present invention therefore relates to solid glassy compositions of formula I:
• X represents at least one halogen chosen from chlorine, bromine 10 e and iodine
• Z represents at least one element chosen from As, Sb and Bi, w, x, y and z represent the respective molar percentages of the elements Te, X, Se and Z, w being a number which can vary from 5 to 50, ⁇ _5 x being a number that can vary from 5 to x. , y being a number which can vary from 5 to 80, z being a number which can vary from 5 to z. , the numbers w, x, y and z being such that the sum (w + x + y + z) is equal to 100, 20 the numbers x and z being such that:
• the restrictive conditions concerning the maximum antimony and bismuth content are conditions generally making it possible to obtain glasses by simple cooling of the mixture of the constituents in the molten state, without rapid cooling (without quenching).
• compositions of the invention some are particularly advantageous in that their thermal analysis does not make it possible to observe any phenomenon linked to crystallization. In other words, these compositions form glasses which are not susceptible to devitrification.
• Such compositions can be found in particular in the following fields: a) compositions for which w is a number which can vary from
• compositions being in particular those for which Z mainly represents As (preferably Z represents As), and in particular those for which X represents ma mainly iodine (X preferably represents iodine);
• the invention also relates to a process for preparing the glass compositions as defined above.
• This process is characterized by the fact that in the proportions indicated by formula I as defined above, a source of tellurium is mixed with a source of halogen, a source of selenium, and a source of the element Z, that the said mixture is heated in an inert atmosphere or under vacuum to a temperature sufficient to obtain a complete melting of the starting materials, that the liquid obtained is maintained at said temperature for a time sufficient to homogenize said mixture. liquid, that, if desired, said mixture is shaped, and cooled to obtain a glassy solid.
• sources of the starting elements one generally uses these elements themselves.
• compounds containing these elements can also be used as sources.
• the source of halogen and tellurium can be TeCl, TeBr, etc.
• the preparation is carried out in a sealed tube, after having evacuated.
• Pyrex glass tubes can be used, for example.
• the temperature to which the starting material is heated can be determined in each case by routine experiments. Generally, the mixture of starting materials is heated to a temperature of the order of about 300 to 600 ° C. For cooling, quenching is generally not necessary. It is sufficient to allow the composition to cool to room temperature.
• the glass compositions of the invention can also be obtained in the form of thin layers, in particular by sputtering.
• They can in particular be fiberized and serve as a waveguide for the light emitted by lasers at CO 2.
• their wide transmission band allows them to be used in infrared radiation analysis or thermal imaging devices.
• the glasses of the invention p 'e adj particular be deposited as thin layers on vitreous substrates of varied nature.
• sputtering it is possible to produce guiding structures with index variation which can serve as a flat waveguide for integrated optics, or for coating optics, for example made of germanium, with layers of significantly lower index.
• a glass rod having a refractive index n is first prepared. , for example having a length of 100mm and a diameter of 6mm.
• n refractive index
• the second method consists in holding the bar of index n 1 in the center of a tube having an inside diameter slightly greater than the diameter of the bar, for example 10 mm. Another glass according to the invention is then poured into the tube, with an index n "of less than n. , said second glass being at a temperature sufficient for the second glass to be in a softened state and to be poured into the tube by filling the space around the bar. The whole is then left to cool as before.
• the following examples illustrate the invention without, however, limiting it.
• Te 20 Se 60 T 10 AS 10 The starting materials are the purified elements, which are introduced, in the required proportions, into a silica tube. A vacuum is made in the part of the silica tube located above the mixture of constituents, then the tube is sealed. The tube is then heated at 350 ° C for two hours to obtain good homogenization. The tube is then allowed to cool to room temperature.
• the glass obtained has a glass transition temperature, measured by differential thermal analysis, with a heating rate of 10 ° C / min. : Tg - 80 ° C.
• glasses containing iodine having the following composition were prepared:
• glasses were prepared, containing bromine, having the following composition:
• glasses were prepared, containing chlorine, having the following composition:

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• Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Geochemistry & Mineralogy (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Glass Compositions (AREA)

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• 1990
  • 1990-07-12 FR FR9008892A patent/FR2664584B1/fr not_active Expired - Fee Related
• 1991
  • 1991-07-12 EP EP91913252A patent/EP0538365A1/de not_active Ceased
  • 1991-07-12 US US07/961,890 patent/US5352639A/en not_active Expired - Fee Related
  • 1991-07-12 WO PCT/FR1991/000574 patent/WO1992000926A1/fr not_active Application Discontinuation

Non-Patent Citations (1)

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