Effect of high magnetic field annealing on the microstructure and magnetic properties of Co–Fe layered double hydroxide

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• 作者：Xiong Zhang ; Dongliang Wang ; Shuxia Zhang ; Yanwei Ma ; Wensheng Yang ; Yi Wang ; Satoshi Awaji ; Kazuo Watanabe
• 关键词：Co– ; Fe layered double hydroxide ; CoFe₂O₄ ; Magnetic field annealing ; Magnetic property
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2010
• 出版时间：October 2010
• 年：2010
• 卷：322
• 期：20
• 页码：3023-3027
• 全文大小：952 K

文摘

The effects of high magnetic field (10 T) on the products obtained by calcination of Co–Fe LDH precursors at different temperatures were investigated. The XRD results indicated that Fe^III substituted for Co^III in Co₃O₄ to yield Co^IICo^IIIFe^IIIO₄ under the calcination of Co–Fe LDH precursors at 400 °C. The products obtained by magnetic field annealing at 400 °C had a porous plate-like morphology, whereas the products without magnetic field annealing were composed of nanoparticles. It was seen that CoFe₂O₄ phase could be formed at low temperature (about 500 °C) under the magnetic field annealing. The grain size of products obtained by magnetic field annealing at 800 °C was larger than that of zero magnetic field. It was found that the saturation magnetization was significantly enhanced after magnetic field annealing, especially at lower temperature (≤600 °C). The possible reason for the effects on the microstructure and magnetic properties of products obtained by magnetic field annealing was discussed.