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Effect of Synthesis Conditions on the Lithium Nonstoichiometry and Properties of La2/3 – x Li3x □4/3 – 2x M2O6 (M = Nb, Ta) Perovskite-like Solid Solutions

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Abstract

The effects of the nominal composition and synthesis conditions on the lithium nonstoichiometry of La2/3 – x Li3x □4/3 – 2x Nb2O6 (I) and La2/3 – x Li3x □4/3 – 2x Ta2O6 (II) solid solutions are studied. The results demonstrate that lithium losses can be reduced from 26–30 to 14–15 mol % in system I and from 15 to 4 mol % in system II. It is shown that the disturbance of electroneutrality caused by Li nonstoichiometry in the solid solutions is eliminated via the formation of oxygen vacancies in positions O(1) (1f: 1/2 1/2 0) and O(2) (1h: 1/2 1/2 1/2) of the cation-deficient perovskite structure. The optimal lithium ion conductivity is offered by solid solutions with □/3x ≃ 2.6 and x ≃ 0.136–0.143.

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  1. Institute of General and Inorganic Chemistry, National Academy of Sciences of Ukraine, pr. Akademika Palladina 32/34, Kiev, 03142, Ukraine

    A. G. Belous, O. N. Gavrilenko, E. V. Pashkova, K. P. Danil'chenko & O. I. V'yunov

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  1. A. G. Belous
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  2. O. N. Gavrilenko
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  3. E. V. Pashkova
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  4. K. P. Danil'chenko
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  5. O. I. V'yunov
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Belous, A.G., Gavrilenko, O.N., Pashkova, E.V. et al. Effect of Synthesis Conditions on the Lithium Nonstoichiometry and Properties of La2/3 – x Li3x □4/3 – 2x M2O6 (M = Nb, Ta) Perovskite-like Solid Solutions. Inorganic Materials 40, 867–873 (2004). https://doi.org/10.1023/B:INMA.0000037935.60011.1b

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  • DOI: https://doi.org/10.1023/B:INMA.0000037935.60011.1b

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