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首页> 外文期刊>CERAMICS INTERNATIONAL >Electric and dielectric study of cobalt substituted Mg-Mn nanoferrites synthesized by solution combustion technique
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Electric and dielectric study of cobalt substituted Mg-Mn nanoferrites synthesized by solution combustion technique

机译：固溶燃烧法合成钴取代的Mg-Mn纳米铁氧体的电和介电研究

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摘要

Cobalt substituted Mg-Mn nanoferrites with formulae Mg_(0.9)Mn_(0.1)Co_xFe_(2-x)O_4, x=0.0, 0.1, 0.2 and 0.3, have been synthesized for the first time by the solution combustion technique. The effects of Co~(2+) ions on the dc resistivity, dielectric constant and dielectric loss tangent of Mg-Mn nanoferrites at room temperature are presented in this paper. X-ray diffraction confirmed the formation of a single phase spinel structure. Particle size was found to increase, 20.9-23.9 nm, with increasing Co~(2+) concentration. The dc resistivity was increased by two order of magnitude with substitution of Co~(2+) ions while the dielectric constant was found to be decreasing with the increasing concentration of cobalt ions. The value of dc resistivity obtained for Mg_(0.9)Mn_(0.1)Fe_2O_4 nanoferrite in our work is greater than the value obtained for the same composition prepared by the conventional ceramic technique. Further, the dielectric constant and dielectric loss tangent were observed to be decreasing with the increase in frequency.
机译：通过溶液燃烧技术首次合成了具有式Mg_（0.9）Mn_（0.1）Co_xFe_（2-x）O_4，x = 0.0、0.1、0.2和0.3的钴取代的Mg-Mn纳米铁氧体。提出了Co〜（2+）离子对室温下Mg-Mn纳米铁氧体的直流电阻率，介电常数和介电损耗正切的影响。 X射线衍射证实了单相尖晶石结构的形成。发现随着Co〜（2+）浓度的增加，粒径增加了20.9-23.9 nm。直流电阻率被Co〜（2+）离子取代后增加了两个数量级，而介电常数随钴离子浓度的增加而降低。在我们的工作中，对于Mg_（0.9）Mn_（0.1）Fe_2O_4纳米铁氧体获得的dc电阻率值大于通过常规陶瓷技术制备的相同组成的dc电阻率值。此外，观察到介电常数和介电损耗正切随频率的增加而减小。

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