期刊
PHYSICA B-CONDENSED MATTER
卷 403, 期 12, 页码 2079-2087出版社
ELSEVIER
DOI: 10.1016/j.physb.2007.11.031
关键词
ceramics; ferroelectric; impedance spectroscopy; modulus analysis; ac conductivity
A tungsten-bronze ceramic oxide, Pb0.68K0.64Nb2O6, has been prepared by a standard solid-state reaction technique. Compound formation and phase identification has been confirmed by X-ray diffraction (XRD) studies. The dielectric permittivity and the loss tangent of the sample have been measured in a frequency range 45 Hz-5 MHz and a temperature range 35-590 degrees C. Electrical properties of the material were studied using an impedance spectroscopic technique. Detailed analysis of the impedance spectrum suggested that the electrical properties of the material are strongly temperature dependent. The Nyquist plots clearly showed the presence of bulk and grain boundary effect in the compound. The imaginary part of modulus at different temperatures shows a relaxation peak and its position shifts to higher frequency with increase in temperature. This suggests a temperature-dependent relaxation. The frequency dependent ac conductivity at different temperatures indicated that the conduction process is thermally activated process.(c) 2007 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据