Optimization of the Fe/Sr ratio in processing of ultrafine strontium hexaferrite powders by a sol-gel autocombustion method

被引：0
|
作者：
S. Alamolhoda
S. A. Seyyed Ebrahimi
A. Badiei
机构：
[1] University of Tehran,Center of Excellence in Magnetic Materials, Department of Metallurgy and Materials
[2] University of Tehran,Department of Chemistry, Faculty of Science
来源：
The Physics of Metals and Metallography | 2006年 / 102卷
关键词：
75.50.Tt; 81.15.Lm;
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学科分类号：
摘要：
A novel sol-gel autocombustion method has been used to synthesize ultrafine particles of strontium hexaferrite. The nitrate citrate gels were prepared from metal nitrates and citric acid with various molar ratios of Fe/Sr. The results showed that the nitrate citrate gel exhibits a self-propagating behavior after ignition in air. The resultant powders with different molar ratios of Fe/Sr were investigated by the differential thermal analysis, thermal gravimetry, and X-ray diffraction techniques. The investigations showed that there was an optimum molar ratio for Fe/Sr in which the calcination temperature for obtaining single-phase strontium hexaferrite is minimum. Scanning electron microscopy was also used to characterize the microstructure of the products. The crystallite size of the resultant powder was about 40 to 50 nm.
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页码：S71 / S73
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