文化大學機構典藏 CCUR:Item 987654321/35908
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    题名: Electrical transport properties of CoMn0.2-xGaxFe1.8O4 ferrites using complex impedance spectroscopy
    作者: Tsay, CY (Tsay, Chien-Yie)
    Lin, YH (Lin, Yi-Hsiang)
    Wang, YM (Wang, Yao-Ming)
    Chang, HY (Chang, Horng-Yi)
    Lei, CM (Lei, Chien-Ming)
    Jen, SU (Jen, Shien-Uang)
    贡献者: 化材系
    关键词: COBALT FERRITE
    MAGNETOSTRICTION COEFFICIENT
    日期: 2016-05
    上传时间: 2017-04-13 15:41:22 (UTC+8)
    摘要: In this study, we report the influence of Ga content on the microstructural, magnetic, and AC impedance properties of Co-based ferrites with compositions of CoMn0.2-xGaxFe1.8O4 (x=0, 0.1, and 0.2) prepared by the solid-state reaction method. Experimental results showed that the as-prepared Co-based ferrites had a single-phase spinel structure; the Curie temperature of Co-based ferrites decreased with increasing Ga content. All ferrite samples exhibited a typical hysteresis behavior with good values of saturation magnetization at room temperature. The electrical properties of Co-based ferrites were investigated using complex impedance spectroscopy analysis in the frequency range of 100 kHz-50 MHz at temperatures of 150 to 250 degrees C. The impedance analysis revealed that the magnitudes of the real part (Z') and the imaginary part (Z") of complex impedance decreased with increasing temperature. Only one semicircle was observed in each complex impedance plane plot, which revealed that the contribution to conductivity was from the grain boundaries. It was found that the relaxation time for the grain boundary (tau(gb)) also decreased with increasing temperature. The values of resistance for the grain boundary (R-gb) significantly increased with increasing Ga content, which indicated that the incorporation of Ga into Co-based ferrites enhanced the electrical resistivity. (C) 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.
    關聯: AIP ADVANCES 卷: 6 期：5 文獻號碼: 055909
    显示于类别:[化學工程與材料工程學系暨碩士班] 期刊論文

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