期刊
CERAMICS INTERNATIONAL
卷 42, 期 12, 页码 14041-14048出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2016.06.011
关键词
Impedance spectroscopy; Electric modulus; AC conductivity; Polaron
In this work, the diphosphate compound, RbFeP2O7, was prepared by the conventional solid-state reaction. The X-ray diffraction pattern revealed that the sample presents a single phase, that crystallizes in the monoclinic structure with a P2(1)/C space group. Impedance analysis was performed using the equivalent circuit model, and, it indicated the presence of intra- and inter-granular contribution. Furthermore, the electrical conductivity, the dielectric properties and the relaxation behavior of this material were studied in detail using the impedance spectroscopy technique, in a frequency ranging from 200 Hz to 5 MHz at several temperatures. The temperature dependency of frequency exponent 's' shows that the correlated barrier-hopping model (CBH) is the most responsible mechanism for AC conduction in the investigated compound. In terms of CBH model, the values of maximum barrier s height, the hopping distance and the density of localized states are determined and discussed. A correlation between electrical and structural properties was also discussed. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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