Complex impedance, dielectric relaxation and electrical conductivity studies of Ba1-xSrxTiO3 ceramics
Complex impedance, dielectric relaxation and electrical conductivity studies of Ba1-xSrxTiO3 ceramics
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DOI：
10.1088/1757-899x/186/1/012018
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发表时间：
2017-03
期刊：
影响因子：
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通讯作者：
A. Elbasset;S. Sayouri S;F. Abdi;T. Lamcharfi;L. Mrharrab
中科院分区：
文献类型：
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作者：
A. Elbasset;S. Sayouri S;F. Abdi;T. Lamcharfi;L. Mrharrab
在这项工作中，我们通过溶胶-凝胶法制备了一系列具有不同锶浓度（x = 0、0.025、0.75、0.10、0.125 和 0.15）的 Ba1-xSrxTiO3 (BSxT) 粉末。使用 XRD 和拉曼技术分析了 Ba1-xSrxTiO3 体系中结构的变化。在室温至 400 °C 的宽频率范围内测量介电弛豫和电导率的场依赖性。根据不同频率下电导率的热变化计算出的活化能表明，Sr 对 BaTiO3 的性能有显着影响。使用复阻抗的虚部 (Z’’(ω)) 和模量 (M’’(ω)) 提取的弛豫时间也遵循阿伦尼乌斯定律，并且在相变温度附近显示出异常。
In this work, we prepared series of Ba1-xSrxTiO3 (BSxT) powders, with different strontium concentrations (x = 0, 0.025, 0.75, 0.10, 0.125 and 0.15), by the sol-gel method. The variation of structure in the Ba1-xSrxTiO3 system was analyzed using XRD and Raman techniques. The field dependence of dielectric relaxation and conductivity was measured over a wide frequency range from room temperature to 400 °C. The activation energy, calculated from the thermal variation of the conductivity for different frequencies, showed that the Sr has significant effects on the properties of BaTiO3. Relaxation times extracted using the imaginary part of the complex impedance (Z’’(ω)) and the modulus (M’’(ω)) were also found to follow the Arrhenius law and showed an anomaly around the phase transition temperature.