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公开(公告)号：US4044112A
公开(公告)日：1977-08-23
申请号：US632059
申请日：1975-11-14
CPC分类号： C01F5/28 , G02B1/00 , C01P2002/01 , C01P2002/82 , C01P2004/51 , C01P2004/61
摘要： A process is disclosed for converting basic magnesium carbonate into pure hot-pressable magnesium fluoride such as is used for the hot-pressing of infra-red radiation transmitting optical bodies. The process includes contacting a slurry of basic magnesium carbonate with carbon dioxide to form enough magnesium bicarbonate or hydrates of magnesium carbonate, in situ, to alter the particles in the slurry. Carbonation of the slurry increases solubility of the solids by establishing an equilibrium relationship in solution between the unstable magnesium bicarbonate and hydrates of magnesium carbonate particles. When the carbonated slurry is contacted with a slight excess of hydrofluoric acid it precipitates solid particles of fine hydrous magnesium fluoride. Neutralization of excess hydrofluoric acid is effected with ammonium hydroxide. The solid particulate precipitate is dried and calcined to yield hot-pressable magnesium fluoride powder of exceptional purity and consistent quality.A hot-pressable magnesium fluoride powder has been prepared which has a specific and uniform refractive index, n.sub.D = 1.3850 at 20.degree. C; the powder is made up of primary particles the majority of which have an average particle diameter of greater than 5 .mu. (microns). These physical properties and a characteristic ill-defined X-ray diffraction pattern suggestive of an amorphous structure, allow the powder to be hot-pressed into an optical body without grinding the powder.
摘要翻译： 公开了用于将碱式碳酸镁转化为纯热压氟化镁的方法，例如用于热压红外辐射透射光学体的方法。 该方法包括将碱式碳酸镁的浆料与二氧化碳接触以形成足够的碳酸氢镁或碳酸镁的水合物，以便改变浆料中的颗粒。 浆料的碳酸化通过在不稳定的碳酸氢镁和碳酸镁颗粒的水合物之间的溶液中建立平衡关系来增加固体的溶解度。 当碳酸化浆液与略过量的氢氟酸接触时，会沉淀出含水氟化镁的固体颗粒。 过量氢氟酸的中和是用氢氧化铵进行的。 将固体颗粒沉淀物干燥并煅烧，得到纯度高，质量一致的热压氟化镁粉末。
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公开(公告)号：US3947553A
公开(公告)日：1976-03-30
申请号：US477508
申请日：1974-06-07
摘要： A malleable or press-forgeable ingot of barium fluoride, for use as an optical body, may be grown from an ultra-pure precipitate of barium fluoride which contains less than 10 parts per million (ppm) of strontium or calcium. A process is disclosed for crystallizing barium nitrate crystals in the presence of nitric acid, reacting barium nitrate with ammonium carbonate to form barium carbonate, recovering barium carbonate crystals, suspending the barium carbonate crystals in water and precipitating barium fluoride with hydrofluoric acid. The barium fluoride crystals are recovered, dried and then calcined in the presence of ammonium fluoride or bifluoride. Barium fluoride (BaF.sub.2) crystals obtained by the process of this invention contain less than 10 ppm of each strontium and calcium.Crystals of an alkaline earth metal fluoride which have been calcined in the presence of a fluoride of ammonium are unexpectedly densified, and are particularly suited for melt-growth of an ingot in a known manner. A maximum concentration of 10 ppm of strontium and calcium in a BaF.sub.2 ingot has been found to be the critical demarcation between a frangible prior art BaF.sub.2 ingot and an ingot of BaF.sub.2 which does not unpredictably shatter when cut, and, which may be reliably press-forged into an optical body.
摘要翻译： 用作光学体的可锻或可压锻的氟化钡锭可以从包含少于10ppm（ppm）锶或钙的氟化钡的超纯沉淀物生长。 公开了一种在硝酸存在下使硝酸钡晶体结晶的方法，使硝酸钡与碳酸铵反应形成碳酸钡，回收碳酸钡晶体，将碳酸钡晶体悬浮在水中，并用氢氟酸沉淀氟化钡。 回收氟化钡晶体，干燥，然后在氟化铵或氟化氢存在下煅烧。 通过本发明方法获得的氟化钡（BaF 2）晶体含有少于10ppm的锶和钙。
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公开(公告)号：US4053572A
公开(公告)日：1977-10-11
申请号：US687049
申请日：1976-05-17
摘要： A malleable or press-forgeable ingot of barium fluoride, for use as an optical body, may be grown from an ultra-pure precipitate of barium fluoride which contains less than 10 parts per million (ppm) of strontium or calcium. A process is disclosed for crystallizing barium nitrate crystals in the presence of nitric acid, reacting barium nitrate with ammonium carbonate to form barium carbonate, recovering barium carbonate crystals, suspending the barium carbonate crystals in water and precipitating barium fluoride with hydrofluoric acid. The barium fluoride crystals are recovered, dried and then calcined in the presence of ammonium fluoride or bifluoride. Barium fluoride (BaF.sub.2) crystals obtained by the process of this invention contain less than 10 ppm of each strontium and calcium.Crystals of an alkaline earth metal fluoride which have been calcined in the presence of a fluoride of ammonium are unexpectedly densified, and are particularly suited for melt-growth of an ingot in a known manner. A maximum concentration of 10 ppm of strontium and calcium in a BaF.sub.2 ingot has been found to be the critical demarcation between a frangible prior art BaF.sub.2 ingot and an ingot of BaF.sub.2 which does not unpredictably shatter when cut, and, which may be reliably press-forged into an optical body.
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4.发明授权Method of preparing doped lithium fluoride thermoluminescent radiation detector 失效掺杂氟化锂热发射辐射探测器的制备方法
公开(公告)号：US5622659A
公开(公告)日：1997-04-22
申请号：US367874
申请日：1995-01-03
申请人： William F. Spicuzza
发明人： William F. Spicuzza
IPC分类号： C01D15/04 , C09K11/61 , C09K11/65 , C09K11/67 , C09K11/70 , C09K11/77 , C09K11/88 , C09K11/00
CPC分类号： C09K11/616 , C01D15/04 , C04B35/553 , C04B35/62675 , C04B35/645 , C09K11/65 , C09K11/675 , C09K11/705 , C09K11/7733 , C09K11/88 , C04B2235/3203 , C04B2235/3206 , C04B2235/3232 , C04B2235/5436 , C04B2235/656 , C04B2235/6567
摘要： A process for preparing doped lithium fluoride suitable for use as a thermoluminescent radiation-sensitive material includes the sequential steps of:1) preparing a mixture of microcrystals of lithium fluoride and one or more dopants;2) heating the mixture at a temperature at which the dopants can diffuse into said microcrystals for a period of time sufficient to produce sensitized microcrystals of lithium fluoride;3) hot pressing the sensitized lithium fluoride microcrystals for a period of time sufficient to prepare a compact of doped polycrystalline lithium fluoride;4) cooling the compact to room temperature.
摘要翻译： 适合用作热发光辐射敏感材料的掺杂氟化锂的制备方法包括以下顺序步骤：1）制备氟化锂和一种或多种掺杂剂的微晶混合物; 2）在掺杂剂可以扩散到所述微晶中的温度下加热混合物一段足以产生氟化锂敏化微晶的时间; 3）将敏化的氟化锂微晶热压一段时间，足以制备掺杂的多晶氟化锂的压块; 4）将压实体冷却至室温。
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