A six-element spinel-type iron-cobalt-chromium-manganese-magnesium-zinc system high-entropy oxide and its powder preparation method

Abstract

The invention discloses a six-element spinel-type iron-cobalt-chromium-manganese-magnesium-zinc high-entropy oxide and a powder preparation method thereof, belonging to the field of high-entropy oxide powder materials. The chemical formula of the high entropy oxide is (FeCoCrMnMgZn) 3 o 4 , whose crystal structure is face-centered cubic, and the space point group is Fd‑3m. The high entropy oxide is based on Fe 2 o 3 、Co 2 o 3 、Cr 2 o 3 , MnO 2 , MgO and ZnO powders are ball milled and mixed in a molar ratio of 1:1:1:2:1:1, dried and sieved; then calcined in a muffle furnace and heated to 800-1000°C for 1-3 hours. The furnace is cooled to room temperature to obtain a single-phase spinel structure (FeCoCrMnMgZn) 3 o 4 High entropy oxide powder material. The preparation method in the present invention has the advantages of low cost, short production cycle, industrialized production, simple operation process and low energy consumption, and the prepared powder has high purity, small particle size and uniform distribution, and can be widely used in supercapacitors Electrodes, lithium-ion battery electrodes, hydrogen production from electrolyzed water and other new energy materials fields.

Description

technical field [0001] The invention belongs to the field of high-entropy oxide powder materials, and in particular relates to a six-element spinel-type iron-cobalt-chromium-manganese-magnesium-zinc system high-entropy oxide and a preparation method for the powder thereof. Background technique [0002] Different from the design concept of traditional alloys using one or two principal elements, high-entropy alloys are alloys with five or more principal elements, and the content of each principal element is between 5wt% and 35wt%. High configuration entropy, so that simple solid solution structures (FCC, BCC, HCP, etc.) can be obtained. High entropy alloys have thermodynamic high entropy effect, kinetic slow diffusion effect, structural lattice distortion effect and performance cocktail response. In 2015, Rost et al. extended this design concept to the study of high-entropy oxide ceramics. In recent years, research on spinel-type high-entropy oxides has begun to attract atte...

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Problems solved by technology

[0008] The preparation method of the spinel type high-entropy oxide that domestic and foreign document reports or Chinese invention patent announces mainly contains two kinds of solid phase reaction method and wet chemical method at present, wherein the heat preservation time that solid phase reaction method adopts is very long (10~ 20 hours, 20 hours, 20-30 hours), and it needs to be placed on an aluminum plate for air quenching, which has the characteristics of relatively complicated process and long cycle; in addition, the spinel type is prepared by wet chemical methods (including solution combustion synthesis method) High-entropy oxides have the characteristics of high raw material cost, many preparation steps, complex and uncontrollable process, etc.

And there is no related report on high-entropy oxides with six-membered spinel structure. The present invention provides a six-membered spinel-type iron-cobalt-chromium-manganese-magnesium-zinc high-entropy oxide and its preparation method

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