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Issue 5, 2002
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Abstract

Dependence of the lattice parameter and Li+ ionic conductivity on the B-site ion substitution in perovskite-related compounds (Li0.1La0.3)yMxNb1 − xO3 (M = Zr, Ti, Ta) has been investigated. According to the calculation based on the classical ionic crystal model, ionic conductivity is expected to increase under the following two conditions: (i) a smaller average charge of B-site cations; and (ii) a larger unit cell. From the powder XRD results, Zr4+ substitution was satisfied with these two conditions. While in the case of Ti4+ substitution the former condition was satisfied, the latter one showed opposite tendency. In the case of Ta5+ substitution, both of the conditions are not changed. Therefore Zr4+-substituted samples were expected to increase the ionic conductivity. However, the ionic conductivity of all the B-site substituted samples decreased with the amount of substitution, in particular, Zr4+-substituted samples showed the lowest ionic conductivity. This disagreement indicates that there is an additional factor affecting the ionic conductivity. We suggest three possible explanations: (1) local distortion introduced by cation substitution; (2) the change of B–O bond covalency; and (3) formation of short-range ordering with B-site substitution.

Graphical abstract: Ionic conduction of lithium in B-site substituted perovskite compounds, (Li0.1La0.3)yMxNb1 − xO3 (M = Zr, Ti, Ta)

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Article information


Submitted
09 Jan 2002
Accepted
21 Feb 2002
First published
26 Mar 2002

J. Mater. Chem., 2002,12, 1500-1504
Article type
Paper

Ionic conduction of lithium in B-site substituted perovskite compounds, (Li0.1La0.3)yMxNb1 − xO3 (M = Zr, Ti, Ta)

M. Nakayama, H. Ikuta, Y. Uchimoto and M. Wakihara, J. Mater. Chem., 2002, 12, 1500
DOI: 10.1039/B200310D

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