Comparison of the Sol-gel Method with the Coprecipitation Technique for Preparation of Hexagonal Barium Ferrite | Health & Environmental Research Online (HERO)

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Citation
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HERO ID

1734899

Reference Type

Journal Article

Title

Comparison of the Sol-gel Method with the Coprecipitation Technique for Preparation of Hexagonal Barium Ferrite

Author(s)

Wang Jing-ping; Liu Ying; Mang Mi-lin; Qiao Ying-jie; Xia Tian

Year

2008

Is Peer Reviewed?

Yes

Journal

Chemical Research in Chinese Universities
ISSN: 1005-9040

Volume

Issue

Page Numbers

525-528

Web of Science Id

WOS:000260451200001

Abstract

Hexagonal barium ferrite BaFe(12)O(19) particles were prepared by sol-gel and coprecipitation methods, respectively, The composition of the so-obtained materials was investigated by means of XRD. By the sol-gel method, non-anticipated intermediate crystalline phases, such as gamma-Fe(2)O(3), alpha-Fe(2)O(3), BaCO(3), and BaFe(2)O(4) etc.. were formed with the delay of the formation of BaFe(12)O(19), The formation of single phase BaFe(2)O(19) required calcination at 850 degrees C for 4 h. On the other hand, using coprecipitation technique, amorphous hydroxide precursor was directly transferred into BaFe(12)O(19) almost without the formation of intermediate crystalline phases. BaFe(12)O(19) was prepared by calcining at 700 degrees C for 3 h. The results were confirmed by ESEM and VSM analyses. Based on the already reported results and the observed results in this study, it can be concluded that the coprecipitaion technique is easier to control than the sol-gel method for preparation of BaFe(12)O(19) at a low temperature.

Keywords

Sol-gel; Coprecipitation; Barium ferrite