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首页> 外文期刊>Physica, B. Condensed Matter >Synthesis, electrical and electromechanical properties of a tungsten-bronze ceramic oxide: Pb0.68K0.64Nb2O6
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Synthesis, electrical and electromechanical properties of a tungsten-bronze ceramic oxide: Pb0.68K0.64Nb2O6

机译：钨青铜陶瓷氧化物Pb0.68K0.64Nb2O6的合成，机电性能

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摘要

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.
机译：通过标准的固态反应技术已制备了钨青铜陶瓷氧化物Pb0.68K0.64Nb2O6。通过X射线衍射（XRD）研究已经证实了化合物的形成和相识别。已在45 Hz-5 MHz的频率范围和35-590摄氏度的温度范围内测量了样品的介电常数和损耗角正切。使用阻抗光谱技术研究了材料的电性能。阻抗谱的详细分析表明，材料的电性能与温度密切相关。奈奎斯特图清楚地表明了复合物中存在体积和晶界效应。在不同温度下模量的虚部显示出一个松弛峰，并且其位置随着温度的升高而移向更高的频率。这表明温度依赖性松弛。 （c）2007 Elsevier B.V.保留所有权利。

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