Preparation method of nano rare earth hexaboride

Abstract

The invention relates to a preparation method of a nano rare earth hexaboride, wherein the preparation method is characterized in that the chemical composition general formula is REB6, and the preparation method is mainly characterized by comprising the steps: (1) weighing one or more of rare earth nitrate, rare earth oxide, sodium hydroxide rare earth or rare earth carbonate according to the preparation amount and stoichiometric ratio of REB6, mixing with nitric acid to prepare a nitric acid rare earth solution, concentrating and evaporating; (2) weighing soluble chlorate and adding the soluble chlorate into the rare earth nitrate solution in the step (1); (3) weighing an organic fuel into the mixed solution in the step (2); and (4) adding boron powder according to the stoichiometric ratio of REB6, uniformly stirring, heating the mixed solution, and concentrating to a viscous state; heating to initiate self-propagating combustion to obtain a product; and washing the product to obtain the nano rare earth hexaboride powder with a stable structure. The method has the characteristics of simple process equipment, controllable particle size, no need of reducing atmosphere, quick reaction and easiness in industrialization.

Description

technical field [0001] The invention belongs to the technical field of rare earth hexaboride preparation, in particular to a preparation method of nanometer rare earth hexaboride. Background technique [0002] my country is a country rich in rare earth resources. As an important cathode material, rare earth hexaboride (REB 6 ) have been studied experimentally and theoretically for a long time. in REB 6 In , the metal atoms are embedded in the boron cage network interconnected by B—B covalent bonds. This cage structure combines the special 4f orbital of rare earth elements and the electron-deficient characteristics of boron elements, so that the material exhibits many excellent properties. : Low work function, high electrical conductivity, high emission current density, high hardness, high melting point, high chemical stability, strong thermal radiation resistance, etc. Stefan S discovered nano-LaB in 2003 6 It has an infrared absorption coefficient in the near-infrared h...

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Problems solved by technology

[0004] In summary, the current synthesis methods generally have problems such as poor performance of the prepared powder or high requirements for preparation equipment, need for atmosphere protection, long production cycle, difficult conditions to control, and high risk factor.

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