阿累尼乌斯方程
电介质
材料科学
介电谱
放松(心理学)
凝聚态物理
大气温度范围
电阻率和电导率
分析化学(期刊)
热力学
化学
活化能
物理
物理化学
电极
社会心理学
量子力学
电化学
光电子学
色谱法
心理学
作者
Chandrahas Bharti,T. P. Sinha
标识
DOI:10.1016/j.physb.2011.02.038
摘要
A single phase rare earth double perovskite oxide Ba2CeNbO6 (BCN) is synthesized by solid-state reaction technique for the first time. The X-ray diffraction pattern of the sample at room temperature shows monoclinic structure, with the lattice parameters, a=5.9763 Å, b=5.975 Å and c=8.48 Å and β=90.04°. Impedance spectroscopy is used to study the ac electrical behavior of this material as a function of frequency (102–106 Hz) at various temperatures (30–450 °C). A relaxation is observed in the entire temperature range. Conduction mechanism is investigated by fitting the complex impedance data to Cole–Cole equation. Complex impedance plane plots show only one semicircular arc, indicating only the grain contribution of dielectric relaxation. The scaling behavior of imaginary part of electric modulus (M″) and imaginary part of electrical impedance (Z″) suggests that the relaxation describes the same mechanism at various temperatures. The frequency dependence of conductivity is interpreted in terms of the jump relaxation model and is fitted to Jonscher's power law. The values of dc conductivities extracted from the Jonscher power law varies from 2.79×10−7 to 3.5×10−5 Sm−1 with the increase in temperature from 100 to 450 °C. The activation energies (0.37 eV) extracted from M″(ω) and Z″(ω) peaks are found to follow the Arrhenius law.
科研通智能强力驱动
Strongly Powered by AbleSci AI