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首页> 外文期刊>Physica, B. Condensed Matter >Structural, dielectric and impedance properties of Ca(Fe2/3W1/3)O-3 nanoceramics
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Structural, dielectric and impedance properties of Ca(Fe2/3W1/3)O-3 nanoceramics

机译：Ca（Fe2 / 3W1 / 3）O-3纳米陶瓷的结构，介电和阻抗特性

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The polycrystalline nanoceramics (similar to 60 nm) of Ca(Fe2/3W1/3)O-3 (CFW) were synthesized by mechanochernical and solid-state reaction techniques. Preliminary X-ray structural analysis of CFW suggested the formation of single-phase compound in tetragonal crystal system (distorted structure of ideal perovskite). The large distortion (similar to 16%) is supported by a large deviation of tolerance factor t = 0.86 from unity (for ideal perovskite). The SEM micrograph shows the polycrystalline nature of the sample with different grain sizes, which are inhomogeneously distributed through the sample surface. Detailed studies of dielectric and impedance properties of the material in a wide range of frequency (1 kHz-1 MHz) and temperatures (300-630 K) show that these properties are strongly temperature and frequency dependent. The nature of variation of AC conductivity exhibits a progressive increase in AC conductivity on increasing temperature. The oxygen vacancies, space charge and mobile charge carriers play an important role in relaxation and conduction process. The relaxation process in the material was found to be of non-Debye type. (c) 2007 Elsevier B.V. All rights reserved.
机译：通过机械化学和固态反应技术合成了Ca（Fe2 / 3W1 / 3）O-3（CFW）的多晶纳米陶瓷（类似于60 nm）。 CFW的初步X射线结构分析表明在四方晶体系统中形成了单相化合物（理想钙钛矿的扭曲结构）。较大的畸变（约16％）由公差因数t = 0.86与单位的较大偏差（对于理想的钙钛矿）所支持。 SEM显微照片显示了具有不同晶粒尺寸的样品的多晶性质，这些晶粒尺寸不均匀地分布在样品表面。对材料在很宽的频率（1 kHz-1 MHz）和温度（300-630 K）范围内的介电和阻抗特性的详细研究表明，这些特性在很大程度上取决于温度和频率。交流电导率变化的性质表现出随着温度升高交流电导率逐渐增加。氧空位，空间电荷和移动电荷载体在弛豫和传导过程中起重要作用。发现材料中的松弛过程是非德拜型的。 （c）2007 Elsevier B.V.保留所有权利。

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