Preparation method of rare-earth-based fluorite type high-entropy oxide powder material

Abstract

The invention discloses a preparation method of a rare-earth-based fluorite type high-entropy oxide powder material and belongs to the field of rare earth oxide powder materials. The method is a low-temperature combustion synthesis method and specifically comprises the following steps: taking rare earth nitride as a metal source and one or a mixture of more of urea, acetic acid, ammonium acetate,oxalic acid and glycine as fuel; and controlling the concentration of metal salt raw materials, types and adding amounts of the fuel, types and adding amounts of a combustion improver and an ignitionmanner to regulate and control properties including granularity, shapes and the like of rare-earth-based fluorite type high-entropy oxide powder. According to the preparation method disclosed by the invention, liquid-phase ingredients are adopted to ensure that a molecular level of the raw materials is uniform and a stoichiometric proportion of a product is realized; meanwhile, the preparation method has the advantages of energy source saving, high production efficiency, greenness and environment protection, no need of complicated post-treatment and the like; and the prepared rare earth oxidepowder has the advantages of high purity, small granularity and uniformity in distribution.

Description

technical field [0001] The invention belongs to the field of rare earth oxide powder materials, and in particular relates to a method for synthesizing a rare earth-based high-entropy oxide powder material with a fluorite structure by low-temperature combustion. Background technique [0002] In recent years, rare earth composite oxides have been widely used in catalysts and catalyst supports, thermal barrier coatings, functional ceramics, oxygen ion conductors, solid fuel cells, optics and magnetism and other fields. The preparation methods of rare earth oxides mainly include precipitation method, homogeneous precipitation method, hydrothermal method, sol-gel method and spray pyrolysis method. The precursor prepared by the precipitation method is prone to agglomeration in the subsequent drying and calcination process; it is difficult to synthesize a pure-phase rare earth composite oxide powder material by the hydrothermal method, which requires harsh reaction conditions such ...

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Problems solved by technology

The patent of China Authorized Notice No. CN105905935B proposes a method for preparing rare earth oxides or composite oxides with large specific surface area by pyrolysis spraying method. This method has complex reaction equipment and preparation process and high reaction temperature; Compounds are used as raw materials, and HCl gas will be generated during the production process

However, this method not only requires more complicated equipment, but also has the disadvantages of complicated preparation process, high reaction temperature and high pressure.

At present, there is no relevant report on the preparation of rare earth-based fluorite-type high-entropy oxide powder materials by low-temperature combustion

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