文章基本信息

标题：Dielectric relaxation, resonance and scaling behaviors in Sr₃Co₂Fe₂₄O₄₁ hexaferrite
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作者：Rujun Tang ; Chen Jiang ; Wenhu Qian 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：5
DOI：10.1038/srep13645
出版社：Springer Nature
摘要：The dielectric properties of Z -type hexaferrite Sr₃Co₂Fe₂₄O₄₁ (SCFO) have been investigated as a function of temperature from 153 to 503 K between 1 and 2 GHz. The dielectric responses of SCFO are found to be frequency dependent and thermally activated. The relaxation-type dielectric behavior is observed to be dominating in the low frequency region and resonance-type dielectric behavior is found to be dominating above 10⁸ Hz. This frequency dependence of dielectric behavior is explained by the damped harmonic oscillator model with temperature dependent coefficients. The imaginary part of impedance ( Z ″) and modulus ( M ″) spectra show that there is a distribution of relaxation times. The scaling behaviors of Z ″ and M ″ spectra further suggest that the distribution of relaxation times is temperature independent at low frequencies. The dielectric loss spectra at different temperatures have not shown a scaling behavior above 10⁸ Hz. A comparison between the Z ″ and the M ″ spectra indicates that the short-range charges motion dominates at low temperatures and the long-range charges motion dominates at high temperatures. The above results indicate that the dielectric dispersion mechanism in SCFO is temperature independent at low frequencies and temperature dependent at high frequencies due to the domination of resonance behavior.