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Structure characteristics and lithium ionic conductivity of La(0.57−2x/3)SrxLi0.3TiO3 perovskites

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Abstract

La(0.57−2x/3)Sr x Li0.3TiO3 perovskites were synthesised using a conventional solid-state reaction. Large Sr2+ ions partially substituting for La3+ ions were found to disturb the cubic perovskite structure and cause the superstructure lines to gradually decrease in the x-ray diffraction patterns and almost disappear when x = 0.12. On the contrast, there still exist superstructure diffraction spots in the electron diffraction pattern on microdomain when x = 0.12. The lithium ion conductivities of the compounds were improved in the range of 0 ≤ x ≤ 0.08, which does not obey the principle of the carrier concentration. An expansion of the unit cell and the disordering of La3+ (Sr2+), Li+ ions and vacancies in A sites could be a mechanism for the enhancement of the conductivity with Sr2+ doping.

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Authors and Affiliations

  1. Energy Storage Materials Program, Institute for Superconducting and Electronic Materials, University of Wollongong, NSW, 2522, Australia

    G. X. Wang, P. Yao, D. H. Bradhurst, S. X. Dou & H. K. Liu

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  1. G. X. Wang
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  2. P. Yao
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  3. D. H. Bradhurst
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  4. S. X. Dou
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  5. H. K. Liu
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Wang, G.X., Yao, P., Bradhurst, D.H. et al. Structure characteristics and lithium ionic conductivity of La(0.57−2x/3)SrxLi0.3TiO3 perovskites. Journal of Materials Science 35, 4289–4291 (2000). https://doi.org/10.1023/A:1004876100938

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