Abstract:
A hydrothermal method for forming nanoparticles of a rare earth element, oxygen and fluorine has been discovered. Nanoparticles comprising a rare earth element, oxygen and fluorine are also described. These nanoparticles can exhibit excellent refractory properties as well as remarkable stability in hydrothermal conditions. The nanoparticles can exhibit excellent properties for numerous applications including fiber reinforcement of ceramic composites, catalyst supports, and corrosion resistant coatings for high-temperature aqueous solutions.
Abstract:
The present invention relates to bismuth oxyfluoride nanocomposites used as positive electrodes in primary and rechargeable electromechanical energy storage systems.
Abstract:
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 M a+ O b F c 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 M a+ F (a-d) B d L x b) converting the precursor into an metal oxide/hydroxide fluoride; and c)calcinating the metal oxide/hydroxide fluoride having the formula M a+ O e H f F c to generate the X-ray amorphous or weakly crystalline metal oxide fluoride of the formula M a+ O b F c , 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,andcis0.lb to l0b; 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.
Abstract translation: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式M a〜(F 1))表示的组成的氟化金属化合物, b)将前体转化为金属氧化物/氢氧化物氟化物; 和c)将具有式M a O + H H F C C C的金属氧化物/氢氧化物氟化物煅烧到 产生式M a a O O b C 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是除水以外的溶剂; a是1,2,3,4,5或6,优选2或3的整数; 并且b和c是符合公式b / 2 + c = a和cis0.lb至l0b的任何数字; 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。