The log(σ) vs. log(ω) derivative plot used to analyze the ac conductivity. Application to fast Li+ ion conductors with perovskite structure

被引：26

作者：

Bucheli, W. ^{[1
]}

Jimenez, R. ^{[1
]}

Sanz, J. ^{[1
]}

Varez, A. ^{[2
]}

机构：

[1] CSIC, ICMM, Madrid 28049, Spain

[2] Univ Carlos III Madrid, Dpto Ciencia Mat, Leganes 28911, Spain

来源：

SOLID STATE IONICS | 2012年 / 227卷

关键词：

Ionic conductivity; Data analysis; Conductivity dispersion; Perovskites; Ceramics; IMPEDANCE SPECTROSCOPY; CONSTANT LOSS; RELAXATION; NMR; DEPENDENCE; DYNAMICS; GLASSES; MODELS;

D O I：

10.1016/j.ssi.2012.09.018

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A criterion is proposed to analyze the dependence of conductivity data vs. frequency log sigma vs. log omega in ionic conductors. The derivative of experimental log sigma vs. log omega data enables a better differentiation of different contributions to the conductivity (bulk, grain boundary, near constant loss (NCL) and others). The usefulness of this procedure is tested for cases with different degrees of convolution between different relaxations. The criterion is applied to real data of two solid electrolytes with perovskite structure. The analysis of La0.5Li0.16Sr0.16TiO3 (LLSr) compound allowed the differentiation of bulk and NCL contributions. The analysis of the fast ion conductor La0.6Li0.2TiO3 (LLTO-06) required an enlargement of the frequency window to precisely study the bulk conductivity and correlation effects on Li motion (determination of n parameter). This methodology can be extrapolated to other solid electrolytes. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：113 / 118

页数：6

共 30 条

[1] Anomalies in Li+ ion dynamics observed by impedance spectroscopy and 7Li NMR in the perovskite fast ion conductor (Li3xLa2/3-x□1/3-2x)TiO3 [J].