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Analytical distributions of relaxation times for the description of electrical conductivity relaxation in ionic conductors

机译:弛豫时间的分析分布,用于描述离子导体中的电导率弛豫

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摘要

Electrical conductivity relaxation was measured in three different ionic conductors (yttria-stabilized zirconia, Li0.5La0.5TiO3 and Li0.5Na0.5La(CrO4)(2)), using the admittance spectroscopy technique. A study of the frequency dependence of the dielectric modulus is presented, which shows that the Havriliak-Negami dielectric functions describe the relaxation process accurately This allows the use of an analytical distribution of relaxation times to determine the time decay function from admittance data in the frequency domain. Electrical conductivity relaxation of the measured ionic conductors has been analysed using this method showing strong non-Debye frequency behaviour and 'stretched'-exponential Kohlrausch-Williams-Watts time decay functions. The results obtained are interpreted in terms of cooperative effects or correlation among ions. Activation energies for long- and short-range ion motion are deduced.
机译:使用导纳光谱技术,在三种不同的离子导体(氧化钇稳定的氧化锆,Li0.5La0.5TiO3和Li0.5Na0.5La(CrO4)(2))中测量了电导率弛豫。提出了对介电模量的频率依赖性的研究,该研究表明,Havriliak-Negami介电函数准确地描述了弛豫过程。这允许使用弛豫时间的解析分布来从频率中的导纳数据确定时间衰减函数。域。使用这种方法分析了被测离子导体的电导率弛豫,显示出很强的非德拜频率行为和“拉伸”指数的Kohlrausch-Williams-Watts时间衰减函数。根据离子之间的协同作用或相关性来解释获得的结果。推导出长距离和短距离离子运动的活化能。

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