Preparation method of high-entropy oxide material

An oxide and high-entropy technology, which is applied in the field of preparation of high-entropy oxide materials, can solve the problem that high-entropy oxide materials have not yet been retrieved, and achieve the effects of uniform morphology, mild reaction conditions and reduced energy consumption.

Active Publication Date: 2020-09-04
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are no relevant reports on the preparation of high-entropy oxide materials by plasma technology

Method used

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  • Preparation method of high-entropy oxide material
  • Preparation method of high-entropy oxide material
  • Preparation method of high-entropy oxide material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 2.424 g of Fe(NO 3 ) 3 9H 2 O, 2.25 g of Al(NO 3 ) 3 9H 2 O, 1.746 g of Co(NO 3 ) 2 ·6H 2 O, 1.746 g of Ni(NO 3 ) 2 ·6H 2 O, 1.782 g of Zn(NO 3 ) 2 ·6H 2 O was dissolved in 60 mL deionized water and stirred evenly to obtain a mixed solution of metal salts; then 0.72 g of urea was weighed and added to the above mixed solution, and stirred evenly; then the above mixed solution was transferred to a polytetrafluoroethylene-lined reactor , heated to 120°C, reacted for 1 h, cooled to room temperature, filtered the reaction solution with deionized water, and washed three times with deionized water to obtain a hydroxide solid powder; finally put the above solid powder into a low-temperature plasma reactor for reaction 20 min (the reaction atmosphere is oxygen, the radio frequency power is 300 W), and the high entropy oxide is obtained. XRD spectrum ( figure 1 ) shows that the prepared (FeAlCoNiZn) 3 o 4 High-entropy oxides have a spinel structure.

Embodiment 2

[0024] Weigh 2.424 g of Fe(NO 3 ) 3 9H 2 O, 2.4 g of Cr(NO 3 ) 3 9H 2 O, 1.746 g of Co(NO 3 ) 2 ·6H 2 O, 1.746 g of Ni(NO 3 ) 2 ·6H 2 O, 1.782 g of Zn(NO 3 ) 2 ·6H 2 O was dissolved in 60 mL deionized water and stirred evenly to obtain a mixed solution of metal salts; then 2.52 g of hexamethylenetetramine was weighed and added to the mixed solution, and stirred evenly; then the mixed solution was transferred to polytetrafluoroethylene In an ethylene-lined reactor, heat to 140°C, react for 1 h, and after cooling to room temperature, filter the reaction solution with suction and wash with deionized water three times to obtain a hydroxide solid powder; finally put the above solid powder into a low-temperature plasma The high-entropy oxide was obtained by reacting in a bulk reactor for 20 min (the reaction atmosphere was oxygen, and the radio frequency power was 400 W). XRD spectrum ( figure 2 ) shows that the prepared (FeCrCoNiZn) 3 o 4 High-entropy oxides have ...

Embodiment 3

[0026] Weigh 2.424 g of Fe(NO 3 ) 3 9H 2 O, 2.4 g of Cr(NO 3 ) 3 9H 2 O, 1.746 g of Co(NO 3 ) 2 ·6H 2 O, 1.746 g of Ni(NO 3 ) 2 ·6H 2 O, 1.45 g of Cu(NO 3 ) 2 ·6H 2 O was dissolved in 60 mL deionized water and stirred evenly to obtain a mixed solution of metal salts; then 2.09 g of arginine was weighed and added to the mixed solution of metal salts, and stirred evenly; then the mixed solution was transferred to a polytetrafluoroethylene liner In the reaction kettle, heat to 100°C, react for 1 h, and after cooling to room temperature, filter the reaction solution with suction and wash with deionized water for 3 times to obtain a hydroxide solid powder; finally put the above solid powder into a low-temperature plasma reactor The high-entropy oxides were obtained after 20 min reaction (the reaction atmosphere was oxygen, and the radio frequency power was 400 W). XRD spectrum ( image 3 ) shows that the prepared (FeCrCoNiCu) 3 o 4 High-entropy oxides have a spinel...

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Abstract

The invention discloses a preparation method of a high-entropy oxide material. The preparation method comprises the following steps: 1) dissolving metal nitrate in deionized water, and carrying out uniform stirring; 2) adding a precipitant into a solution obtained in the step 1), and carrying out uniform stirring; 3) preparing hydroxide solid powder from the solution obtained in the step 2) by using a hydrothermal method; and 4) putting the solid powder obtained in the step 3) into a low-temperature plasma reactor for treatment to obtain a high-entropy oxide. By adopting liquid-phase proportioning, metal elements can be uniformly mixed at a molecular level, high-temperature calcination treatment is avoided in the synthesis process, energy consumption is remarkably reduced, reaction conditions are mild, reaction process is green and environment-friendly, almost no pollution is caused, and wastes are rarely generated. The high-entropy oxide material prepared by the method is uniform in morphology, the high-entropy oxide material is determined to be a spinel phase according to XRD, and element content determination shows that the proportion of contained elements is close to equimolar.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and mainly relates to a preparation method of a high-entropy oxide material. Background technique [0002] In recent years, high-entropy materials have attracted extensive attention of researchers due to their unique structure and adjustable function. High-entropy materials are entropy-stable crystal structures with more than five metal elements, and the elements contained are almost equimolar in proportion and evenly distributed to ensure the maximum configuration entropy of the system. In highly disordered multicomponent systems, high entropy produces attractive properties, such as high entropy effects, severe lattice distortion, slow diffusion, and cocktail effects, etc. High-entropy oxides are a new type of ceramic material developed based on the concept of high-entropy alloys. In 2015, Rost et al. prepared the first high-entropy oxide (Mg,Ni,Co,Cu,Zn)O by mechanical grinding a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/626
CPCC04B35/265C04B35/2658C04B35/2666C04B35/62605C04B35/62665C04B2235/3217C04B2235/3241C04B2235/3275C04B2235/3279C04B2235/3281C04B2235/3284C04B2235/443C04B2235/6583C04B2235/666
Inventor 王双印顾开智王东东王燕勇田静龙鹏李巍
Owner HUNAN UNIV
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