Percolation-limited ionic diffusion in Li0.5-xNaxLa0.5TiO3 perovskites (0 ≤ x ≤ 0.5)

被引：66

作者：

Rivera, A

León, C

Santamaría, J

Várez, A

V'yunov, O

Belous, AG

Alonso, JA

Sanz, J

机构：

[1] CSIC, Inst Ciencia Mat Madrid, E-28049 Madrid, Spain

[2] Univ Complutense Madrid, GFMC, Dept Fis Aplicada 3, E-28040 Madrid, Spain

[3] Univ Carlos III Madrid, Dept Ciencia Mat, Madrid 28911, Leganes, Spain

[4] Ukrainian Acad Sci, Inst Inorgan Chem, UA-252680 Kiev, Ukraine

来源：

CHEMISTRY OF MATERIALS | 2002年 / 14卷 / 12期

关键词：

D O I：

10.1021/cm0204627

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：

The dependence of ionic transport properties on the structure and composition of perovskites Li0.5-xNaxLa0.5O3 (0 less than or equal to x less than or equal to 0.5) has been analyzed by means of ND, XRD, NMR, and impedance spectroscopy. Local lithium mobility is shown to decrease progressively by 2 orders of magnitude along the series; however, long-range dc conductivity decreases sharply at x = 0.2 more than 6 orders of magnitude. The decrease of dc conductivity from values typical of fast ionic conductors, 10(-3) S/cm at room temperature, to values of insulators, 10(-10) S/cm, is discussed in terms of a three-dimensional percolation model for lithium diffusion. As deduced from XRD and ND data, the number of vacant sites in conduction pathways is controlled by the amount of Na and La in the perovskite.

引用

页码：5148 / 5152

页数：5

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