WO2005116305A1 - フッ化カルシウム結晶の製造方法 - Google Patents
フッ化カルシウム結晶の製造方法 Download PDFInfo
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- WO2005116305A1 WO2005116305A1 PCT/JP2005/009852 JP2005009852W WO2005116305A1 WO 2005116305 A1 WO2005116305 A1 WO 2005116305A1 JP 2005009852 W JP2005009852 W JP 2005009852W WO 2005116305 A1 WO2005116305 A1 WO 2005116305A1
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- calcium fluoride
- crucible
- crystal
- single crystal
- producing
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/20—Halides
- C01F11/22—Fluorides
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B11/00—Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/12—Halides
Definitions
- the present invention relates to a calcium fluoride single crystal for use as an optical material in the vacuum ultraviolet region, and a method for producing a calcium fluoride crystal as a pretreatment product for producing the single crystal, and particularly relates to an ArF excimer. Laser or F laser as the light source
- the present invention relates to a method for producing a calcium fluoride single crystal having excellent light transmittance, which is suitable for an optical member for an optical device.
- the resolution of the projection optical system is determined by the wavelength of the light used and the NA (numerical aperture) of the projection optical system. That is, the shorter the wavelength of the light used and the larger the NA of the projection optical system, the higher the resolution can be.
- the wavelength of the light source used in the projection exposure apparatus has already been g-line (wavelength 436 nm), i-line (wavelength 365 nm), and KrF excimer laser light (wavelength 248 nm). ). In the future, ArF excimer laser light with a shorter wavelength (wavelength 193 nm) and F
- the optical system of the excimer laser projection exposure apparatus uses quartz glass or a fluoride crystal, for example, calcium fluoride (CaF) single crystal as an optical member.
- the Bridgman method also called a vertical Bridgman method because a vertical furnace is generally used
- a vertical Bridgman method because a vertical furnace is generally used
- an example of a method for producing a calcium fluoride single crystal by the Bridgman method will be described.
- a chemically synthesized high-purity calcium fluoride is used as a raw material of a calcium fluoride single crystal for use in the ultraviolet or vacuum ultraviolet region.
- high-purity calcium fluoride is generally provided in the form of a powder
- Japanese Patent Application Laid-Open No. 2002-154897 (Reference 1) discloses a material having a particle size of 0.1 ⁇ m to 5 mm as a raw material of calcium fluoride single crystal for vacuum ultraviolet optics. It is described that calcium fluoride powder is suitable.
- fluoridating agents are also called scavengers and have an effect of replacing elements contained as impurities in the raw material powder with fluorine, and removing the substituted impurity elements as volatile compounds.
- fluoridating agents are also called scavengers and have an effect of replacing elements contained as impurities in the raw material powder with fluorine, and removing the substituted impurity elements as volatile compounds.
- lead fluoride is added to a raw material powder of calcium fluoride and then heated and melted in a heating furnace, oxygen contained as calcium oxide (CaO) in the raw material powder is converted into volatile oxidized lead ( PbO).
- a general process of performing single crystallization by a vertical Bridgman method using a pretreated product of calcium fluoride as a raw material is as follows. That is, by setting the crucible pretreatment products Filling in the single crystal manufacturing apparatus, to maintain the production apparatus in a vacuum atmosphere of 10- 3 ⁇ 10- 4 Pa. When the inside of the manufacturing equipment reaches the above-mentioned degree of vacuum, it is heated by the upper heater and the temperature in the crucible is reduced Raise the temperature to above the melting point of calcium fluoride (1370 ° C to 1450 ° C) to melt the pretreated product.
- the crystal is gradually grown from the lower part of the crucible by pulling down the crucible at a speed of about 0.1 to 5 mm / h toward the area of the lower heater which is set at a lower temperature than the upper heater in advance.
- the process ends when the liquid crystallizes to the top.
- the manufactured single crystal (generally called an ingot) is gradually cooled to near room temperature so as not to be broken, and then the manufacturing apparatus is opened to the atmosphere and the ingot is taken out.
- powdery calcium fluoride may be directly used as a raw material of the Bridgman method without passing through a pretreatment product.
- powdered calcium fluoride is added with a fluoride agent such as lead fluoride, filled into a crucible of a vertical Bridgman furnace, heated and melted to remove oxygen impurities, and then directly subjected to a crystal growth process. Then, the crucible is lowered at a constant speed to produce a calcium fluoride single crystal ingot.
- a fluoride agent such as lead fluoride
- the most important index for evaluating an optical member such as a lens made of calcium fluoride single crystal is the light transmittance at the wavelength used.
- the transmittance for light having a wavelength of 157 nm is extremely important. This is because an optical member having a low transmittance at the used wavelength is easily damaged by the absorbed light energy, and is liable to cause further damage such as a further decrease in the transmittance and physical destruction.
- the transmittance suitable for an optical member of an exposure apparatus is 99.5% or more for an optical member having a thickness of 1 cm.
- the transmittance value of 99.5% is an internal transmittance excluding surface reflection of the optical member, and is a value in an initial state before laser beam irradiation.
- a fluorinating agent such as lead fluoride is added in the pre-processed product manufacturing process or the single crystal manufacturing process in order to remove oxygen impurities in the raw material. Is done. At this time, if the amount of the fluoridating agent is small relative to the amount of oxygen impurities, the removal of oxygen is insufficient, and if the amount of the fluorinating agent is excessive, calcium fluoride is excessively removed.
- the fluorinating agent remains in the crystal, and in the case of V or deviation, it also causes a decrease in light transmittance in the vacuum ultraviolet region.
- powdered calcium fluoride has a problem that the dispersion of oxygen impurities is large, it is difficult to control the addition amount of the fluorinating agent, and the light transmittance of the manufactured calcium fluoride single crystal is stable.
- the present inventors have studied in detail the properties of powdered calcium fluoride used as a raw material for calcium fluoride crystals.
- the oxygen impurities contained in the powdered fluorinated calcium oxide are mainly caused by the water contained in the individual powder particles, and the fluctuation of the water content over time and in space causes the variation in the amount of oxygen impurities. Identified the cause.
- the present inventors have investigated the causes of fluctuations in the water content, and found that the water content increases due to the atmospheric gas force absorbed during storage, and that there is a strong correlation between the water adsorption amount and the BET specific surface area. Revealed that there was.
- the calcium fluoride single crystal is stable in a state where the water content of the raw material is low, and has a high light transmittance at a vacuum ultraviolet wavelength. Have been found to be stable.
- the method for producing a calcium fluoride crystal of the present invention includes a filling step of filling calcium crucible into a crucible, a melting step of heating the crucible to melt the calcium fluoride, and a step of melting the molten fluoride. Crystallization of calcium fluoride by cooling and crystallizing the calcium fluoride to obtain calcium fluoride crystals, wherein the BET specific surface area force of the calcium fluoride filled in the crucible is 3 ⁇ 4m 2 / g or less.
- the calcium fluoride filled in the crucible has a water content of 700 ppm or less, and a scavenger (calcium) together with the calcium fluoride. It is preferable to fill the crucible with the fluorine-containing agent. Further, in the present invention, it is preferable that the melting step and the crystallization step are performed in an evacuated atmosphere.
- the melted calcium fluoride is cooled to grow a calcium fluoride single crystal to obtain a calcium fluoride single crystal.
- the step of cooling and crystallizing the thus melted calcium fluoride is simply performed.
- the obtained calcium fluoride crystal becomes a single crystal and can be used as it is as an optical member.
- a refilling step of filling the calcium fluoride crystal obtained in the crystallization step into a crucible, and heating the crucible to form the calcium fluoride may further include a remelting step of melting the crystal and a recrystallization step of cooling the melted calcium fluoride to grow a calcium fluoride single crystal to obtain a calcium fluoride single crystal.
- the remelting step and the recrystallization step are performed in an evacuated atmosphere.
- the calcium fluoride crystal obtained in the crystallization step is a polycrystal
- the single crystal can be used as an optical member.
- the calcium fluoride polycrystal obtained in the crystallization step is increased in bulk density by being melted and melted, and is suitable as a pretreatment product for producing a single crystal.
- the manufactured calcium fluoride single crystal has a high transmittance with respect to an ArF excimer laser beam having a wavelength of 193 nm. It can be suitably used as an optical member for an excimer laser optical system.
- the FET laser beam having a wavelength of 157 nm, shorter in wavelength than the ArF excimer laser is obtained.
- the present inventors have found that a calcium fluoride single crystal having high transmittance can be produced. That is, calcium fluoride crystals produced using calcium fluoride having a BET specific surface area of 0.4 m 2 / g or less as raw materials are single crystals as they are, and polycrystals are used as pretreated products to prepare single crystals. By manufacturing, it is suitable as an optical member for F laser optical system.
- the BET specific surface area of the fluorinated rubber filled in the crucible be 0.4 m 2 / g or less. It is particularly preferred that the water content of calcium iodide be less than 100 ppm.
- the BET specific surface area refers to the nitrogen gas adsorption at the temperature of liquid nitrogen. Therefore, it means the specific surface area calculated from the measured BET surface area and the mass of the sample.
- FIG. 1 is a schematic cross-sectional view showing one example of an apparatus for producing a calcium fluoride crystal.
- FIG. 2 is a schematic cross-sectional view showing one example of an apparatus for producing a calcium fluoride single crystal.
- a feature of the method for producing a calcium fluoride crystal according to the present invention is that the BET specific surface area of the Futani calcium used as a raw material is set to a predetermined value or less.
- the BET specific surface area is calculated from the mass W of the sample and the total surface area S of the sample measured by the BET method at a liquid nitrogen temperature using nitrogen gas as an adsorption gas.
- the total surface area S of the sample is measured by the BET multipoint method or the BET-point method.
- the specific surface area of calcium fluoride is limited to a predetermined value or less, thereby limiting the amount of water adsorbed by the storage atmosphere power to a certain value or less.
- the present inventors presume that it has become possible to reduce the excess or deficiency of the fluorinating agent due to the variation in the water content and to reduce the variation in the quality of the calcium fluoride crystal caused by the variation.
- the diameter equivalent strength of each powder particle is also calculated.
- the total surface area including the micro to nanopores present inside the particle is measured, not only the geometric surface area. . Since the pores inside such particles occupy a large proportion as sites for adsorbing moisture from the atmosphere, by limiting the BET specific surface area to a predetermined value or less, the fluorinated power between the raw material and the external atmosphere is reduced. It reduces the adsorption and desorption of water and stabilizes the amount of water contained in the raw material.
- the inventors of the present invention have experimentally revealed that the water content of calcium fluoride as a crystal raw material depends on the production of a crystal used as an optical member for an ArF excimer laser optical system. Should be less than 700 ppm.
- the concentration be less than 100 ppm.
- the unit (ppm) of the water content is expressed on a mass basis.
- the first embodiment of the present invention relates to a method for producing a calcium fluoride crystal as a pretreatment product for producing a single crystal.
- FIG. 1 shows an example of an apparatus for producing a pre-processed product.
- the bell jar 1 and the base plate 2 constitute a vacuum container, and the through holes existing in these are kept airtight by a sealing member such as an O-ring.
- the inside of the vacuum vessel can be evacuated from the exhaust port 3 by a vacuum pump (not shown).
- a heater 17 is arranged so as to surround the crucible 5.
- the bell jar 1 and the base plate 2 constituting the vacuum vessel are required to have sufficient mechanical strength to withstand the atmospheric pressure applied during evacuation. It must also have some degree of corrosion resistance to reactive gases that may be introduced into or generated inside the vacuum vessel. Therefore, it is desirable that the bell jar 1 and the base plate 2 are made of stainless steel, which is a material having these properties.
- the heater 7 is controlled to a predetermined temperature by a control system (not shown).
- the control system of the heater may be a general system such as a temperature sensor, a temperature controller, and a power controller.
- the crucible 5 can be controlled to a temperature equal to or higher than the melting point of the calcium fluoride 6.
- the crucible 5 is supported by the support member 4 inside the heater 7. Since the crucible 5 and the upper portion of the support member 4 are heated to a temperature equal to or higher than the melting point of calcium fluoride, the crucible 5 must be made of a material that can withstand high temperatures. Must. In addition, since the crucible 5 comes into direct contact with calcium fluoride, it is required that the crucible 5 be made of a material that is not taken in by calcium fluoride as an impurity and has no adverse effect. As a material that satisfies the above conditions, it is desirable that the upper portions of the crucible 5 and the support member 4 are made of a carbon material.
- Calcium fluoride having a BET specific surface area of 3 m 2 / g or less is used as a raw material of the pretreated product.
- the raw material has a BET specific surface area of 3 m 2 / g or less, the fluctuation of the water content can be kept low even if the storage atmosphere changes. Therefore, if the content of oxygen impurities is quantified when the raw materials are first obtained, the change in the amount of oxygen impurities due to the adsorption and desorption of moisture can be ignored even if the storage atmosphere fluctuates thereafter. It is not necessary to determine the amount of oxygen impurities each time the raw material is used. In addition, since the optimal amount of scavenger added based on the initial quantitative value is constant regardless of the subsequent change in the storage atmosphere, the quality of the pre-treated product may vary due to excessive or insufficient scavenger. Be suppressed.
- a predetermined amount of a scavenger is added, and the crucible 5 of the manufacturing apparatus is filled (filling step).
- the bell jar 1 is fixed to the base plate 2, and the inside is evacuated from the exhaust port 3.
- the heater 7 is energized to start heating. Continue evacuation during heating to remove adsorbed gas such as moisture and oxygen as much as possible. Is desirable.
- the temperature at which the crucible 5 reacts with the raw material and the scavenger i.e., the decomposition temperature of the scavenger.Temperature + about 100 ° C (for example, lead fluoride (PbF
- the temperature is raised to about 800 ° C to 900 ° C) and maintained, and the temperature is raised to a temperature above the melting point of the raw material (about 1370 ° C to 1450 ° C).
- the vacuum evacuation is not continued, and the force is maintained for a predetermined time to volatilize the excess scavenger and the reaction product and to melt the raw material (melting step).
- the power supply to the heater 7 is stopped, and the temperature of the calcium fluoride in the crucible 5 is gradually decreased to solidify the melt to obtain calcium fluoride crystals (crystallization step).
- the method of the present embodiment it is possible to stably produce a calcium fluoride crystal in which the amount of impurities is smaller than that of the raw material and the bulk density is increased. Further, if the calcium fluoride crystal produced by the method of the present embodiment is used as a pretreatment product for producing a single crystal, a calcium fluoride single crystal suitable for an optical member for an ArF excimer laser optical system can be produced. Can be. Furthermore, if calcium fluoride with a BET specific surface area force of 0.4 m 2 / g or less is used as a raw material, it is suitable for the production of calcium fluoride single crystals suitable for optical members for F-laser optical systems.
- the second embodiment of the present invention relates to a method for producing a single crystal using a pretreated product of calcium fluoride as a raw material.
- the single crystal manufacturing apparatus used in the second embodiment is a vertical bridgeman furnace having the structure shown in FIG.
- the heater is divided into an upper part and a lower part.
- the bell jar 36 and the base plate 35 constitute a vacuum container.
- the upper heater 21 and the lower heater 22 are independently temperature controlled, and the upper heater 21 constitutes a high temperature section and the lower heater 22 constitutes a low temperature section.
- the control system of the heater may be a general system having power such as a temperature sensor, a temperature controller, and a power controller, but it is necessary that at least calcium fluoride 31 can be controlled to a constant temperature equal to or higher than its melting point.
- a crucible 25 containing calcium fluoride 31 is arranged inside the heater.
- the crucible 25 is driven by a lowering mechanism 26 via a crucible support member 24.
- the crucible 25 and the upper part of the support member 24 may be heated to a temperature higher than the melting point of calcium fluoride, It must be made of a material that can withstand high temperatures.
- the crucible 25 comes into direct contact with the fluorinated fluoride 31, it is required that the crucible 25 be made of a material that is not taken into the calcium fluoride as an impurity and adversely affects the crucible 25.
- it is desirable that the crucible 25 and the upper part of the support member 24 are made of carbon material.
- a calcium fluoride crystal (pre-treated product) manufactured by the method of the first embodiment is used as a raw material.
- the bell jar 36 is fixed to the base plate 35 and the inside is evacuated from the exhaust port 37. After the inside is sufficiently evacuated, the upper heater 21 and the lower heater 22 are energized, and the crucible 25 is heated above the melting point of calcium fluoride to melt the filled calcium fluoride 31 to form a melt. (Re-melting step).
- the upper heater 21 and the lower heater 22 are adjusted to predetermined temperatures to form a temperature gradient in the furnace.
- the temperature gradient is such that the upper heater 21 side has a high temperature and the lower heater 22 side has a low temperature, so that the melting point of calcium fluoride 31 is obtained at an intermediate point between the two.
- a single crystal growth step is started.
- the crucible 25 is gradually lowered by the crucible lowering mechanism 26.
- the calcium fluoride melt in the crucible passes through the melting point as it is lowered, and a single crystal grows from the bottom of the crucible (recrystallization step).
- the crucible 25 is pulled down to the bottom, and when the crucible content is completely solidified, the crucible 25 is cooled down to room temperature, and the calcium fluoride single crystal formed in the crucible 25 is taken out to obtain a calcium fluoride single crystal.
- the calcium fluoride single crystal thus produced is cut into a desired shape, and subjected to heat treatment, polishing, surface treatment, and the like, as necessary, to obtain an optical member suitable for an ArF excimer laser optical system. be able to.
- the raw material for producing the pretreated product was mixed with calcium fluoride having a BET specific surface area of 0.4 m 2 / g or less. Then, an optical member suitable for the F excimer laser optical system can be manufactured.
- the third embodiment of the present invention relates to a method for directly producing calcium fluoride single crystals of calcium fluoride.
- the BET specific surface area power used in the first embodiment as a raw material is not more than 3 ⁇ 4m 2 / g (more preferably 0.4 m 2 / g). g or less) may be used directly.
- a calcium fluoride single crystal can be directly obtained from the calcium fluoride by the same process as in the second embodiment described above, and the obtained calcium fluoride single crystal is directly used as an optical member. You can use it.
- the crucible 25 is filled with a predetermined amount of a scavenger together with the calcium fluoride. Further, the steps corresponding to the refilling step, the remelting step, and the recrystallization step in the second embodiment correspond to the filling step, the melting step, and the crystallization step, respectively, in the third embodiment. .
- the present invention is not limited to the above embodiment.
- the manufacturing apparatus and the manufacturing method based on the vertical Bridgman method have been described as examples.
- the single crystal manufacturing method used in the practice of the present invention is not limited to the vertical Bridgman method, It is also possible to use a method generally considered suitable for producing a calcium fluoride single crystal, such as the Kralski method.
- Table 1 shows the relationship between the moisture content and the specific surface area of four types of Fusidani calcium nibs, A (Example 1), B (Example 2), C (Example 3), and D (Comparative Example 1). Shows the results of
- the BET surface area of calcium fluoride was measured by the following method. That is, heat treatment was performed at 180 ° C for 60 minutes as a pretreatment of the sample.
- the adsorption gas used for the surface area measurement was nitrogen gas, and the nitrogen gas adsorption amount was measured at liquid nitrogen temperature.
- the water content of calcium fluoride was measured by the Karl Fischer method.
- Methods for measuring moisture in solids include the Karl Fischer method, dry mass method, infrared absorption method, and dielectric constant method.However, since the moisture amount corresponding to the specific surface area range according to the present invention is extremely small, The measurement by the mass method and the infrared absorption method is difficult, and here, the Carl Fisher method is adopted.
- the Karl Fischer moisture meter used for measuring the water content was equipped with a sample chamber with a heater, and the moisture desorbed by heating the sample was introduced into the Karl Fischer solution by a carrier gas and consumed by the moisture.
- This is an apparatus configured to titrate the amount of iodine in a solution.
- the temperature of the sample chamber was measured at 180 ° C, and nitrogen gas at a flow rate of 250 ml / min was used as the carrier gas.
- the crucible 5 of the pretreatment product manufacturing apparatus having the structure shown in FIG. 1 was filled, the bell jar 1 was fixed to the base plate 2, and the inside was evacuated. Energizing the heaters 7 when it reaches the interior of the vacuum force 10- 3 Pa, and heating the crucible 5 to 800 ° C while continuing the evacuation.
- Crucible 5 to 8 After maintaining at 00 ° C for 10 hours, the temperature was further increased to 1450 ° C to melt calcium fluoride 6, and the state was maintained for 8 hours to allow the scavenge reaction to proceed sufficiently. Next, the temperature was gradually lowered to solidify the melt to obtain calcium fluoride crystals. Through the above steps, a total of 16 lots of calcium fluoride crystals were produced using the four types of raw materials.
- the calcium fluoride crystal produced by the above-described process was charged into a crucible 25 of a single crystal production apparatus as a pretreated product, and the inside of the apparatus was evacuated.
- the crucible 2 5 When the degree of vacuum reached 10- 4 Pa is positioned at the top, the upper heater 21 1450 ° C, to melt the calcium fluoride 31 by setting the lower heater 22 to 1300 ° C.
- the crucible 25 was pulled down at a constant speed of 0.2 mm / hour to grow a single crystal.
- the temperature was gradually cooled to around room temperature, and then the inside of the manufacturing apparatus was opened to the atmosphere to take out a single crystal (ingot).
- a test piece was prepared from a total of 16 calcium fluoride single crystal ingots thus manufactured, and the light transmittance at wavelengths of 193 nm and 157 nm was measured.
- the test piece was formed into an appropriate size and shape so that it could be installed in the sample chamber of the device for measuring transmittance.
- the two parallel surfaces facing the test piece were mirror polished, the parallelism was 30 seconds or less, and the surface roughness was 0.5 nm RMS or less.
- the transmittance was measured after cleaning the surface of the test piece sufficiently to clean it.
- a vacuum ultraviolet spectrophotometer was used as a device for measuring the transmittance. The measured transmittance was corrected for the thickness and surface reflection of the test piece, and an ingot having an internal transmittance of 99.5% or more per 1 cm was regarded as a passed product.
- Table 2 shows the relationship between the BET specific surface area of calcium fluoride used as a raw material and the number of accepted calcium fluoride single crystal ingots finally obtained.
- the light transmittance at 193nm is ArF excimer laser wavelength
- for a passing rate forces the one in ingot using the raw material D having a BET specific surface area of 4.00m 2 / g (Comparative Example 1)
- raw materials A (Example 1), B (Example 2), and Biji (Example 3) having a BET specific surface area of 1.99 m 2 / g or less were used, all four materials reached the acceptance criteria, respectively. It was confirmed that a single crystal suitable as an optical member for an ArF excimer laser optical system could be stably manufactured.
- an optical member for an ArF excimer laser optical system or an F laser optical system can be obtained.
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CN105271346A (zh) * | 2015-11-12 | 2016-01-27 | 山东建筑大学 | 一种氟化钙微球的制备方法 |
CN111379024A (zh) * | 2018-12-29 | 2020-07-07 | 北京首量科技股份有限公司 | 一种氟化钙的制备工艺及其设备 |
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JP5112105B2 (ja) * | 2008-02-18 | 2013-01-09 | 住友重機械工業株式会社 | 減速材及び減速装置 |
JP6035584B2 (ja) * | 2010-11-26 | 2016-11-30 | 日本結晶光学株式会社 | 蛍石結晶の製造方法 |
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JP2001240497A (ja) * | 2000-02-29 | 2001-09-04 | Kobe Steel Ltd | フッ化物単結晶製造方法及び製造装置 |
JP2002154897A (ja) * | 2000-11-14 | 2002-05-28 | Nikon Corp | フッ化カルシウム単結晶の製造方法、フッ化カルシウム単結晶 |
JP2004315255A (ja) * | 2003-04-14 | 2004-11-11 | Nikon Corp | フッ化物結晶の製造方法、フッ化物結晶、光学系、及び光リソグラフィ装置 |
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JP2001240497A (ja) * | 2000-02-29 | 2001-09-04 | Kobe Steel Ltd | フッ化物単結晶製造方法及び製造装置 |
JP2002154897A (ja) * | 2000-11-14 | 2002-05-28 | Nikon Corp | フッ化カルシウム単結晶の製造方法、フッ化カルシウム単結晶 |
JP2004315255A (ja) * | 2003-04-14 | 2004-11-11 | Nikon Corp | フッ化物結晶の製造方法、フッ化物結晶、光学系、及び光リソグラフィ装置 |
Cited By (2)
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---|---|---|---|---|
CN105271346A (zh) * | 2015-11-12 | 2016-01-27 | 山东建筑大学 | 一种氟化钙微球的制备方法 |
CN111379024A (zh) * | 2018-12-29 | 2020-07-07 | 北京首量科技股份有限公司 | 一种氟化钙的制备工艺及其设备 |
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