Compositional, temperature and frequency dependence of dielectric behaviour of zinc substituted copper- ferri-chromates

M. C. Chhantbar; K. B. Modi; H. H. Joshi

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Compositional, temperature and frequency dependence of dielectric behaviour of zinc substituted copper- ferri-chromates

机译：锌取代铜-铬铁酸盐的介电性能的成分，温度和频率依赖性

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The comprehensive study on compositional, temperature and frequency dependent dielectric properties of ZnxCu1?xFeCrO4 (x = 0.0, 0.2, 0.4 and 0.6 ) was carried out by means of a. c. resistivity (ρac), dielectric constant (ε′) and loss tangent (tanδ) measurements in the frequency range from 100 Hz to 1 MHz at different temperatures ranging from 40 °C to 500 °C. An abnormal behaviour of ε′ as a function of temperature is explained on the basis of contribution of two types of charge carriers in the polarization process. It is found that magnetic ordering does not have marked influence on the dielectric properties. The probable conduction mechanism in the present system is due to electron transition such as Fe2+ $ leftrightarrows $ Fe3+ and Cu2+ $ leftrightarrows $ Cu1+ rather than ionization or polaron hopping mechanism.

机译：利用a对Znx _{Cu1？x FeCrO4（x = 0.0、0.2、0.4和0.6）的组成，温度和频率相关介电性能进行了综合研究。 C。电阻率（ρac），介电常数（ε'）和损耗角正切（tanδ）在40 Hz至500°C的不同温度下在100 Hz至1 MHz的频率范围内测量。根据极化过程中两种电荷载流子的贡献，解释了ε'随温度的异常行为。已经发现，磁性排序对介电性能没有明显的影响。在本系统中可能的传导机理是由于电子跃迁，例如Fe2 + $ leftrightarrows $ Fe3 + 和Cu2 + $ leftrightarrows $ Cu1 + ，而不是电离或极化子跳跃机理。}

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《Journal of Materials Science》 |2007年第16期|6989-6995|共7页
作者
M. C. Chhantbar; K. B. Modi; H. H. Joshi;
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Department of Physics Saurashtra University Rajkot 360 005 India;

Department of Physics Saurashtra University Rajkot 360 005 India;

Department of Physics Saurashtra University Rajkot 360 005 India;

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Compositional, temperature and frequency dependence of dielectric behaviour of zinc substituted copper- ferri-chromates

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