Effects of B-site ion (M) substitution on the ionic conductivity of (Li3xLa2/3−x)1+y/2(MyTi1−y)O3 (M=Al, Cr) |
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| Authors: | LX He HI Yoo |
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| Affiliation: | Solid State Ionics Research Laboratory, School of Material Science and Engineering, Seoul National University, Seoul 151-742, South Korea |
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| Abstract: | Effect on the ionic conductivity of B-site ion (M) substitution in (Li3xLa2/3−x)1+y/2MyTi1−yO3 (M=Al, Cr) has been investigated. It has been found that partial substitution of smaller Al3+ for Ti4+ is effective to enhance the ionic conductivity of Li3xLa2/3−xTiO3. At 300 K, the maximum bulk conductivity of (1.58±0.01)×10−3 S cm−1 is observed from the composition of (Li0.39La0.54)1−y/2AlyTi1−yO3 with y=0.02 (x=0.13), that is the highest yet reported for known perovskite solutions at room temperature. The conductivity enhancement is interpreted as being due to the substitution-induced bond-strength change rather than due to bottleneck size change for Li migration, TiO6-octahedron tilting or A-site cation ordering. |
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| Keywords: | Li3xLa2/3&minus xTiO3 Ionic conductivity Li-ion conductors Perovskite Ion substitution |
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