摘要:
The present invention relates to the manufacturing of high purity optical flouride crystals, the making of purified optical flouride crystal feedstocks and to the anionic purification of optical fluoride crystalline materials. The invention relates generally to methods for removing oxide impurities from optical fluoride crystal feedstocks. More specifically, the invention relates to a method for preparing purified optical fluoride crystal feedstocks and the use of the feedstock in manufacturing VUV
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:
An object of the present disclosure is to provide a fluoride-ion battery capable of achieving high charge and discharge capacities. The fluoride-ion battery of the present disclosure comprises a positive electrode active material layer, a negative electrode active material layer, and an electrolyte layer formed between the positive electrode active material layer and the negative electrode active material layer. In the fluoride-ion battery of the present disclosure, the negative electrode active material layer contains metallic magnesium, magnesium fluoride, and calcium barium fluoride, wherein a mass ratio of metallic magnesium to magnesium fluoride is 0.1 to 10.0.
摘要:
A method for treating wastewater containing fluorine is disclosed. The method for treating wastewater includes applying a vacuum to a membrane unit including a membrane having a hollow, injecting wastewater into the membrane unit so that the wastewater contacts an outer surface of the membrane, recovering hydrofluoric acid gas by evaporating hydrofluoric acid (HF) in the wastewater based on a vacuum applied to the inner surface of the membrane and moving the evaporated hydrofluoric acid (HF) to the inner surface through the membrane, injecting sweep gas into the membrane unit to discharge hydrofluoric acid gas remaining on the inner surface of the membrane, and forming a metal fluoride by reacting the recovered hydrofluoric acid gas with a metal oxide or metal hydroxide using a scrubbing process.
摘要:
The present invention provides a method of producing hollow magnesium fluoride particles by performing polymerization at the interface of micelle constituted of a hydrophobic solvent, a hydrophilic solvent, and a surfactant. The invention further provides an antireflection coating having a low refractive index due to the coating by the hollow magnesium fluoride particles and also provides an optical device coated with the antireflection coating and an imaging optical system having the optical device. In the method, micelle is formed from a hydrophobic solvent, a hydrophilic solvent, and a surfactant, and then a fluorine compound and a magnesium compound are dissolved in the micelle solution to polymerize magnesium fluoride at the interface of the micelle.
摘要:
The present invention is related to a method for preparing an amorphous metal fluoride of the formula MX+FX−δ comprising the steps of a) providing a precursor, whereby the precursor comprises a structure having a formula of Mx+F(x−δ)−yBy; and b) reacting the precursor with a fluorinating agent generating the amorphous metal flouride having a formula of Mx+Fx−δ, whereby M is selected from the group comprising metals of the second, third and fourth main group and any subgroup of the periodic table, B is a coordinately bound group; x is any integer of 2 or 3; y is any integer between 1 and 3; δ is 0 to 0.1; and x−δ>y.
摘要:
The present invention is related to a method for preparing an X-ray amorphous or weakly crystalline metal oxide fluoride of a composition represented by the formula Ma+ObFc comprising the steps of b) providing a precursor, whereby the precursor is a fluorinated metal compound having a composition which is represented by the formula Ma+F(a−d)BdLxb) converting the precursor into an metal oxide/hydroxide fluoride; and c) calcinating the metal oxide/hydroxide fluoride having the formula Ma+OcHfFc to generate the X-ray amorphous or weakly crystalline metal oxide fluoride of the formula Ma+ObFc, whereby M is selected from the group comprising metals of the first, second, third and fourth main group and any subgroup of the periodic table; B is a group or an anion which is selected from the group comprising alkoxide, enolates, alkyl, chloride, bromide, iodide, nitrate, and organic acid anions; B is preferably an alkoxy group; L is a solvent other than water; a is any integer of 1, 2, 3, 4, 5 or 6, preferably 2 or 3; and b and c are any numbers obeying the formula b/2+c=a, and c is 0.1b to 10b; d is a number between 0 and 0.8a, preferable between 0.1 and 0.3a; e is (a−c+f)/2; f is a number between 0 and (a−c); and x is between 0 and 6.
摘要翻译:本发明涉及一种制备由下式表示的组合物的X射线无定形或弱结晶金属氧化物氟化物的方法: c)包括以下步骤:b)提供前体,由此所述前体是具有由下式表示的组成的氟化金属化合物:(a) b)将前体转化为金属氧化物/氢氧化物氟化物; 和c)将具有下式的金属氧化物/氢氧化物氟化物煅烧:将式M a -O + 产生式M a O b O b C c C的X射线无定形或弱结晶金属氧化物氟化物,其中M选自 包括第一,第二,第三和第四主族的金属和周期表的任何亚组; B是选自醇盐,烯醇化物,烷基,氯化物,溴化物,碘化物,硝酸盐和有机酸阴离子的基团或阴离子; B优选为烷氧基; L是水以外的溶剂; a是1,2,3,4,5或6,优选2或3的整数; b和c是符合公式b / 2 + c = a的任何数字,c是0.1b〜10b; d是0和0.8a之间的数,优选在0.1和0.3a之间; e为(a-c + f)/ 2; f是0和(a-c)之间的数字; x在0和6之间。
摘要:
A sol comprising silica-magnesium fluoride hydrate composite colloidal particles used in an anti-reflection coating material for forming an anti-reflection coating and a process for its preparation are provided. A sol comprising silica-magnesium fluoride hydrate composite colloidal particles having a ratio of silica to magnesium fluoride hydrate MgF2.nH2O, n being in the range between 0.25 and 0.5, in terms of a SiO2/MgF2 weight ratio of from 0.01 to 5 and a primary particle size of 5 to 50 nm. A process for the preparation of an aqueous sol comprising silica-magnesium fluoride hydrate composite colloidal particles which comprises the steps of adding an aqueous fluoride solution to a mixture liquid of a silica sol and an aqueous magnesium salt solution to produce a slurry of an agglomerate comprising silica-magnesium fluoride hydrate composite colloidal particles and removing the salts formed as by-products. A process for the preparation of an organosol further comprising the step of replacing water in the aqueous sol with an organic solvent.