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首页> 外文期刊>Materials Chemistry and Physics >Dielectric Behavior And Ac Electrical Conductivity Study Of Sm~(3+) Substituted Mg-zn Ferrites
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Dielectric Behavior And Ac Electrical Conductivity Study Of Sm~(3+) Substituted Mg-zn Ferrites

机译：Sm〜（3+）替代Mg-zn铁氧体的介电行为和AC电导率研究

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摘要

Polycrystalline soft ferrites, Mg_(1-x)Zn_xFe_(2-y),Sm3,O_4 (x = 0,0.2, 0.4,0.6,0.8 and 1.0; y = 0,0.05 and 0.10) was prepared by usual ceramic method. The single-phase spinel formation of ferrites was confirmed by X-ray diffraction technique. The dielectric measurements were carried out at room temperature as a function of frequency and composition. The experimental results reveal that dielectric constant and dielectric loss tangent decrease where as ac electrical conductivity increases as frequency increases. The ac electrical conductivity is derived from the dielectric measurements. The dielectric behavior is attributed to the Maxwell-Wagner type interfacial polarization. The conduction mechanism in these ferrites is due to electron hopping between Fe~(2+) and Fe_~(3+) ions on adjacent octahedral sites. The composition dependence of ε' and σ_(ac) indicate that they increase with increase in Zn ion substitution and reach a maximum value and then they decrease. The addition of Sm_~(3+) content decreases the dielectric constant.
机译：通过常规陶瓷方法制备多晶软铁氧体Mg_（1-x）Zn_xFe_（2-y），Sm3，O_4（x = 0,0.2,0.4,0.6,0.8和1.0; y = 0,0.05和0.10）。通过X射线衍射技术证实了铁素体的单相尖晶石形成。介电测量是在室温下根据频率和成分进行的。实验结果表明，介电常数和介电损耗正切减小，其中交流电导率随频率增加而增加。交流电导率是从介电测量得出的。介电行为归因于麦克斯韦-瓦格纳型界面极化。这些铁氧体中的传导机制是由于相邻八面体位点上的Fe〜（2+）和Fe_〜（3+）离子之间的电子跳跃。 ε'和σ_（ac）的成分依赖性表明它们随着Zn离子取代的增加而增加，并达到最大值，然后降低。 Sm_〜（3+）含量的增加降低了介电常数。

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