Low-temperature preparation method of Co ferrite Nano powder

A technology of cobalt ferrite and nano-powder, which is applied in the field of nano-material preparation, can solve the problems of reducing powder calcination activity, high cost, and difficult industrial application, and achieves good magnetic properties, uniform size, and low cost. Effect

Inactive Publication Date: 2010-07-28
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The key to achieve low-temperature sintering and high performance of ferrite is to prepare ultra-fine high-activity powder. There have been many reports on the synthesis of ferrite ultra-fine powder by wet chemical methods, especially the sol-gel method is more suitable for multi-component iron Oxygen superfine powder synthesis, but the usual sol-gel powder production generally has the disadvantages of high cost and difficulty in industrial application, and high temperature calcination is required to synthesize the powder of the required crystal phase, and hard agglomeration is easy to occur during the calcination process. Calcination activity of the powder

Method used

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  • Low-temperature preparation method of Co ferrite Nano powder

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Take Co(CH 3 CO 2 ) 2 4H 2 O, Fe(NO 3 ) 3 9H 2 O and citric acid are raw materials, analytically pure ethylene glycol methyl ether and water are mixed as a solvent, and the volume ratio is 7:1, and 4.982 grams of Co(CH 3 CO 2 ) 2 4H 2 O, 16.165 g Fe(NO 3 ) 3 9H 2 O was dissolved in 100mL of the above mixed solvent to obtain a transparent solution, and then 15.130 g of citric acid was added to the solution, and analytically pure ammonia water was slowly added dropwise to the solution under stirring conditions, and the pH value was adjusted to about 6. Evaporate slowly to form a brown sol, then heat to 130°C until a brown-black xerogel is formed, transfer it to an oven at 250°C, the xerogel will undergo self-propagating combustion to form a dendritic fluffy product, and the particle size will be obtained after grinding evenly Tan iron cobalt oxide powder of about 20nm. The structure of the product is shown in the X-ray diffraction (XRD) pattern, such as figu...

Embodiment 2

[0017] Take Co(CH 3 CO 2 ) 2 4H 2 O, Fe(NO 3 ) 3 9H 2 O and malic acid are raw materials, analytical pure ethylene glycol methyl ether and water are mixed as a solvent, and the volume ratio is 8:1, and 6.227 grams of Co(CH 3 CO 2 ) 2 4H 2 O, 20.206 g Fe(NO 3 ) 3 9H 2 O was dissolved in 120mL of the above mixed solvent to obtain a transparent solution, and then 12.068 grams of malic acid was added to the transparent solution, and the pH value was adjusted to about 6 with analytical pure ammonia water under stirring, and refluxed in a water bath at 70°C for 12 hours to form a brown-black dry coagulation Gel, transfer it into an oven at 250°C, the dry gel will undergo self-propagating combustion to form a dendritic fluffy product, and after uniform grinding, a brown cobalt ferrite powder with a particle size of about 22nm is obtained.

Embodiment 3

[0019] Take Co(CH 3 CO 2 ) 2 4H 2 O, Fe(NO 3 ) 3 9H 2 O and lactic acid are raw materials, analytical pure ethylene glycol methyl ether and water are mixed as a solvent, and the volume ratio is 9:1, and 7.473 grams of Co(CH 3 CO 2 ) 2 4H 2 O, 24.247 g Fe(NO 3 ) 3 9H 2 O was dissolved in 150 mL of the above mixed solvent to obtain a transparent solution, and then 9.729 g of lactic acid was added to it, and the pH value was adjusted to about 6 with analytical pure ammonia water under stirring, and the solution was slowly evaporated in a water bath at 70°C to form a brown sol, and then heated Transfer it to an oven at 250°C until it forms a brown-black xerogel at 150°C. The xerogel will undergo self-propagating combustion to form a dendritic fluffy product. After grinding evenly, a brown cobalt iron oxide with a particle size of about 25nm will be obtained. body powder.

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Abstract

The invention discloses a low-temperature preparation method of Co ferrite Nano powder. Co(CH3CO2)2.4H2O, Fe(NO3)3.9H2O and poly-hydroxyl carboxylic acid are used as raw materials, and analytically pure ethylene glycol methyl ether and water are mixed to be used as a solvent, wherein the volume ratio of the analytically pure ethylene glycol methyl ether to water is (7-9):1. The preparation method comprises the following steps of: firstly, dissolving Co(CH3CO2)2.4H2O and Fe(NO3)3.9H2O in the mixed solvent; secondly, adding poly-hydroxyl carboxylic acid to the solution, slowly dropping analytically pure ammonia water to the solution under a stirring condition, adjusting the pH value to approximate 6, and slowly evaporating the solution to form the brown sol in a water bath at 70 DEG C; thirdly, heating the sol to 130 DEG C or refluxing for 12h till the sol forms the brownish black xerogel, transferring the xerogel to an oven at 250 DEG C, wherein the xerogel can combust automatically to produce the dendritic and bulking products, and grinding the products to obtain the Co ferrite Nano powder. The low-temperature preparation method of the Co ferrite Nano powder has simple process, low cost, easily controllable chemical constituent, good repetition and easy doping; and the particle of the prepared product has good dispersibility, uniform size and good magnetic properties.

Description

technical field [0001] The invention relates to a nano material preparation technology, in particular to a low-temperature preparation method of cobalt ferrite nano powder. Background technique [0002] Low-temperature sintering of ferrite is the key technology for preparing multilayer chip inductors (MLCI). The key to achieve low-temperature sintering and high performance of ferrite is to prepare ultra-fine high-activity powder. There have been many reports on the synthesis of ferrite ultra-fine powder by wet chemical methods, especially the sol-gel method is more suitable for multi-component iron Oxygen superfine powder synthesis, but the usual sol-gel powder production generally has the disadvantages of high cost and difficulty in industrial application, and high temperature calcination is required to synthesize the powder of the required crystal phase, and hard agglomeration is easy to occur during the calcination process. Calcination activity of the powder. Contents ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/02C04B35/32
Inventor 肖顺华胡金张琳宝音
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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