Structural, dielectric and magnetic properties of NiFe2O4 prepared via sol–gel auto-combustion method
Structural, dielectric and magnetic properties of NiFe2O4 prepared via sol–gel auto-combustion method
复制标题
溶胶凝胶自燃烧法制备NiFe2O4的结构、介电和磁性能
DOI：
10.1016/j.jmmm.2016.08.003
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发表时间：
2017
影响因子：
2.7
通讯作者：
Yongjia Zhang
中科院分区：
文献类型：
--
作者：
Li Sun;Ru Zhang;Zhenduo Wang;Lin Ju;Ensi Cao;Yongjia Zhang
采用溶胶-凝胶自燃烧法合成了NiFe 2 O 4粉体，并研究了其显微结构、介电性能和磁性能随温度的变化关系。XRD和SEM分析结果表明，NiFe 2 O 4具有典型的尖晶石结构，颗粒分布均匀。介电常数和介电损耗的测量结果表明，所有的样品的强烈的频率依赖性。随着烧结温度的升高，介电损耗测量的频率依赖性中观察到的峰向更高的频率偏移，表明Debye样介电弛豫。随着晶粒尺寸的增大，剩磁增大，而矫顽力则相反。当烧结温度高于1000 °C时，样品的饱和磁化强度可达50 emu/g，在1300 °C烧结2 h时，样品的磁化强度最低，为159.49 Oe。
Nickelferrite (NiFe2O4)powders were synthesized via sol–gel auto-combustion method and the corresponding temperature dependence of microstructure, dielectric and magnetic properties have been investigated. Results of XRD and SEM indicate that the NiFe2O4samples exhibit a typical single phase spinel structure and a uniform particle distribution. The dielectric constant and dielectric loss measurements show strong frequency dependence of all the samples. The peak observed in frequency dependence of dielectric loss measurements shifts to higher frequency with the increasing sintering temperature, indicating a Debye-like dielectric relaxation. The remanent magnetization increases with the increasing grain size while the coercivity is just the opposite. The saturation magnetization can achieve 50 emu/g when the sintering temperature is more than 1000 °C, and the lowest coercivity (159.49 Oe) was observed in the NFO sample sintered at 1300 °C for 2 h.