A KIND OF HYDROGEN-CONTAINING RARE-EARTH HALIDE AND METHOD FOR PREPARE THE SAME AND THEIR APPLICATIONS

摘要

The present invention provides hydrogen containing rare earth halides, methods for their preparation and applications. The hydrogen-containing rare earth halide comprises a compound of the general formula REX _a-b H _b and an unavoidable impurity, wherein a = 2 or a = 3, 0.000005 ≦ b ≦ 0.0001, RE is a rare earth element, and X is a halogen to be. The hydrogen-containing rare earth halides have a very low content of water and oxygen. When the rare earth hydride is used as a raw material and reacted with ammonium halide, there is no moisture in the product, and a small amount of oxide impurities are present in the rare earth hydride. Even if a small amount of oxide reacts with ammonium halide, the same rare earth halide is produced. Therefore, the rare earth metal raw material itself contains an excessive amount of oxide, thereby reducing the problem of increasing the impurity content. Also, the rare earth oxide and ammonium halide are not sufficiently reacted or hydrolyzed during dehydration and oxidized, so that the content of water and oxygen is too high. The problem can be avoided. The hydrogen-containing rare earth halide of the present invention has a very low oxygen content, and a small amount of hydrogen element helps to reduce the oxidation of the rare earth halide in use, making mass production easier, and the prospect of industrial application. good.