Study on the synthesis and magnetic properties of rod-shaped NiFe₂O₄ ferrites via precipitation-toptactic reaction employing Na₂C₂O₄ and NaOH as precipitants

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• 作者：Xiaohui Cao ; Xiaoyu Guo ; Hongfei Dong ; Jinhong Meng ; Jie Sun
• 关键词：A. Magnetic materials ; B. Chemical synthesis ; C. X-ray diffraction ; C. Electron microscopy ; D. Magnetic properties
• 刊名：Materials Research Bulletin
• 出版年：January, 2014
• 年：2014
• 卷：49
• 期：Complete
• 页码：229-236
• 全文大小：2026 K

文摘

Rod-shaped NiFe₂O₄ ferrites were prepared by precipitation-toptactic reaction with the aid of pod-like 纬-FeOOH template using Na₂C₂O₄ and NaOH as precipitants. The NiFe₂O₄ ferrite prepared using Na₂C₂O₄ precipitant experienced the formation of 纬-Fe₂O₃ and NiO through dehydroxylation of 纬-FeOOH and decomposition of nickel salt, transition of 纬-Fe₂O₃ into 伪-Fe₂O₃ and production of NiFe₂O₄ from the reaction of NiO and 伪-Fe₂O₃. The NiFe₂O₄ ferrite prepared using NaOH precipitant included the formation of 纬-Fe₂O₃ and NiO through dehydroxylation of 纬-FeOOH, decomposition of nickel salt and production of NiFe₂O₄ from the reaction of NiO and 纬-Fe₂O₃. The transition of 纬-Fe₂O₃ into 伪-Fe₂O₃ was found in the synthesis process of NiFe₂O₄ ferrite prepared using Na₂C₂O₄ precipitant. It was found that the NiFe₂O₄ ferrite prepared using NaOH precipitant had larger length to diameter ratio and better crystallinity, and higher coercivity and lower saturation magnetization.