HIGH-ENTROPY OXIDE CERAMICS BASED ON COPPER-MANGANESE SPINEL FOR ELECTROCONDUCTIVE MATERIALS AND METHOD FOR PRODUCING POWDERS FROM IT Russian patent published in 2024 - IPC C04B35/01 C04B35/626 H01M4/1391 B82Y40/00 

FIELD: electroconductive materials.

SUBSTANCE: oxide ceramics based on copper-manganese spinel and a method of producing ceramic powders are intended for creating materials with high electrical conductivity in an average temperature range of 300–800 °C, which can be used as material for current collection in solid oxide fuel cells, as electrodes with working temperature in specified range, as catalysts, thin films and coatings, as well as a component of composites, including cermets. Creation of high-entropy ceramics based on CuMn₂O₄ by way of directed alloying with main and minor dopants increases the stability range of the cubic phase of spinel, inhibits the nucleation process of other phases, reduces the rate of degradation with improved conducting properties. As the main dopants, the ceramic contains Li⁺ and Ni²⁺ in amount of 0.05–0.3, and as minor dopants—Zn²⁺, Mg²⁺ and Cr³⁺, Sc³⁺, Al³⁺ in amount of 0–0.15 to fill the tetra- and octa-position of the crystalline structure of the spinel, respectively, which enable to optimize the characteristics of the materials without deterioration of the main properties of the ceramics. Complex composition of high-entropy ceramics enables to control its properties. Disclosed is an economical method of producing ceramic powders by burning a solution of nitrate salts of the necessary elements with the addition of glycine as fuel, by supplying the solution in the form of a spray to the hot surface of the reactor or to the hot substrate.

EFFECT: method is simple to implement and can be implemented on different scales without emissions of nitrogen oxides into atmosphere and with minimum consumption of glycine and polyethylene glycol as fuel.

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