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Method for preparing nano-structure of metal chromite series compound

A technology of metal chromite and nanostructure, which is applied in the direction of chromium compounds, chemical instruments and methods, nanotechnology, etc., to achieve the effects of convenient operation, low production cost and simple process

Active Publication Date: 2014-08-06
江苏天园项目管理集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, to explore a simple and universal chemical preparation method to synthesize a wide range of metal chromite series compounds, especially to prepare their nanostructures, has always been a great challenge. In materials, physics, chemistry, etc. areas of great research significance

Method used

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  • Method for preparing nano-structure of metal chromite series compound
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  • Method for preparing nano-structure of metal chromite series compound

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: Europium chromite (EuCrO 3 ) preparation.

[0022] 1) Weigh 2mmol potassium chromate and 1mmol europium nitrate, and dissolve them in 20mL ethylene glycol and water mixed solvent (5mL ethylene glycol + 15mL distilled water, that is, the volume ratio of ethylene glycol to water is 1:3 ), under magnetic stirring, the potassium chromate solution was gradually added dropwise to the europium nitrate solution to form a suspension.

[0023] 2) Transfer the obtained suspension to a 50mL reaction autoclave, seal it, and react at a constant temperature of 150°C for 12-24 hours, and naturally cool to room temperature after the reaction.

[0024] 3) The hydrothermal reaction product is subjected to suction filtration, washed alternately with water and ethanol several times, and dried at 50° C. for 6 hours to obtain europium chromite powder product.

Embodiment 2

[0025] Embodiment 2: neodymium chromite (NdCrO 3 ) preparation.

[0026] 1) Weigh 2mmol potassium chromate and 1mmol neodymium nitrate, and dissolve them in 20mL ethylene glycol and water mixed solvent (5mL ethylene glycol + 15mL distilled water, that is, the volume ratio of ethylene glycol to water is 1:3 ), under magnetic stirring, the potassium chromate solution was gradually added dropwise to the neodymium nitrate solution to form a suspension.

[0027] 2) Transfer the obtained suspension to a 50mL reaction autoclave, seal it, and react at a constant temperature of 150°C for 12-24 hours, and naturally cool to room temperature after the reaction.

[0028] 3) The hydrothermal reaction product is subjected to suction filtration, washed alternately with water and ethanol several times, and dried at 50° C. for 6 hours to obtain a neodymium chromite powder product.

Embodiment 3

[0029] Embodiment 3: cobalt chromite (CoCr 2 o 4 ) preparation.

[0030] 1) Weigh 2mmol potassium chromate and 2mmol cobalt chloride, and dissolve them in 20mL ethylene glycol and water mixed solvent (10mL ethylene glycol + 10mL distilled water, that is, the volume ratio of ethylene glycol to water is 1: 1), under magnetic stirring, gradually add the potassium chromate solution to the cobalt chloride solution dropwise to form a suspension.

[0031] 2) Transfer the obtained suspension to a 50mL reaction autoclave, seal it, and react at a constant temperature of 150°C for 6-12 hours, and naturally cool to room temperature after the reaction.

[0032] 3) The hydrothermal reaction product is subjected to suction filtration, washed alternately with water and ethanol several times, and dried at 50° C. for 6 hours to obtain a cobalt chromite powder product.

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Abstract

A method for preparing a nano-structure of a metal chromite series compound is characterized by comprising the following steps: firstly using potassium chromate and soluble metal salt to composite a chromate precursor, then performing in-situ reduction on the chromate by using a glycol water solution in a solvothermal system, and washing to obtain the metal chromite. The technology of the method has the following obvious advantages that 1, the method is based on the solvothermal technology, is simple in process, convenience to operate, low in manufacturing cost, and environmental-friendly, and has no special equipment requirements; 2, the glycol in-situ reduction technology belongs to wet-chemistry methods, and an obtained product has a certain morphological character; 3, the method has excellent universality on the wide preparation of metal chromite series compounds.

Description

technical field [0001] The invention belongs to the field of inorganic material chemistry and relates to a general preparation method of chromite series compounds. Background technique [0002] Metal chromites usually have a perovskite structure (MCrO 3 , M is a trivalent metal, such as: rare earth metals, etc.) or spinel structure (MCr 2 o 4 , M is a divalent metal, such as alkaline earth metal, transition metal, etc.). First of all, this type of material has a very high melting point and is a good refractory material. Combined with its superior oxidation resistance and electrical conductivity, it has great application potential in solid oxide fuel cells; secondly, the unique electronic structure of Cr element determines The system materials have novel magnetic properties, especially for those magnetic transition metal chromites and rare earth chromites, because the materials contain two magnetic elements, they show more complex magnetic characteristics, and some materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G37/00B82Y30/00
Inventor 雷水金王传宁刘磊
Owner 江苏天园项目管理集团有限公司
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