期刊
CURRENT APPLIED PHYSICS
卷 14, 期 12, 页码 1727-1733出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cap.2014.10.005
关键词
Solid-state reaction; Nyquist plot; Grain boundary segregation; Maxwell-Wagner polarization
The present work investigates the polarization response in polycrystalline Ni0.9-yCuyZn0.1Fe1.98O4-delta (y = 0, 0.1, 0.2, 0.3, 0.4, 0.5) ferrite synthesized by solid-state reaction method. X-ray diffraction analysis confirmed cubic spinel phase formation in the calcined samples. Sintered samples contain a continuous network of CuO-rich segregation along the grain boundaries for y >= 0.2. Dielectric spectra showed a relaxation peak for y >= 0.2 in the frequency range of 1 kHz-1 MHz. This relaxation has been explained based on Maxwell-Wagner polarization considering two-layer model in connection with two heterogeneous dielectric media. (C) 2014 Elsevier B.V. All rights reserved.
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