Ionic conduction of lithium for Perovskite-type compounds, Li
x
La(1?
x
)/3NbO3 and (Li0.25La0.25)1?
x
Sr0.5
x
NbO3 |
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| Authors: | Yoshihiro Kawakami Hiromasa Ikuta Masataka Wakihara |
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| Institution: | (1) Department of Chemical Engineering, Faculty of Engineering, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro, Tokyo 152, Japan Tel.: +81-3-5734 3037; Fax: +81-3-5734 2146; e-mail: mwakihar@o.cc.titech.ac.jp, JP |
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| Abstract: | Perovskite-type compounds, Li
x
La(1−
x
)/3NbO3 and (Li0.25La0.25)1−
x
Sr0.5
x
NbO3 as lithium ionic conductors, were synthesized by a solid-state reaction. From powder X-ray diffraction, the solid solution
ranges of the two compounds were determined to be 0≤x≤0.25 and 0≤x≤0.125, respectively. In the Li
x
La(1−
x
)/3NbO3 system, the ionic conductivity of lithium at room temperature, σ25, exhibited a maximum value of 4.7 × 10−5 S · cm−1 at x = 0.10. However, because of the decrease in the lattice parameters with increasing Li concentration x˙, σ25 of the samples decreased with increasing x from 0.10 to 0.25. Also, in the (Li0.25La0.25)1−
x
Sr0.5
x
NbO3 system, the lattice parameter increased with the increase of Sr concentration and the σ25 achieved a maximum (7.3 × 10−5 S · cm−1 at 25 °C) at x = 0.125.
Received: 12 September 1997 / Accepted: 15 November 1997 |
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| Keywords: | Lithium ionic conductor Perovskite-type compound Lithium lanthanum niobate Lithium lanthanum strontium niobate Ionic conductivity |
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