Abstract
Lithium ion conductivity of lithium hexaoxozirconate Li8ZrO6 doped by Mg2+, Sr2+, Nb5+, V5+, and Ce4+ cations was studied using impedance spectroscopy. The NMR data indicate that in the low-temperature region, lithium ion migration takes place by exchange of Li+ among tetra- and octahedral positions. Data of Raman spectroscopy suggest that the potential reason for the sharp increase of Li8ZrO6 and its solid solutions’ conductivity near 700 K may be melting of LiOH which occurs as a result of interaction between samples and atmospheric moisture.
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17 July 2018
The authors are grateful to A. L. Buzlukov and I. Y. Arapov for performing the 7Li NMR experiments.
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Acknowledgments
The authors are grateful to S.V. Plaksin and E.G. Vovkotrub. The research has been carried out with the equipment of the Shared Access Center “Composition of Compounds” of the Institute of High-Temperature Electrochemistry of Ural Branch of RAS, Yekaterinburg, Russian Federation.
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Highlights
Li8ZrO6 doped by M2+, A5+, and Ce4+ was studied using impedance, Raman study, and NMR. The maximum conductivity (9 × 10-6 S cm−1 at 476 К) is observed for Li7.98Zr0.98V0.02O6. Below 700 K, Li+ ions move via jumps between octahedral and tetrahedral positions. In all cases, conductivity shows a jump-like rise at 680–710 K. One of the reasons for a jump of conductivity near 700 K may be the melting of LiOH.
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Shchelkanova, M.S., Shekhtman, G.S., Kalashnova, A.V. et al. Lithium ion conductivity of solid solutions based on Li8ZrO6. J Solid State Electrochem 22, 2959–2964 (2018). https://doi.org/10.1007/s10008-018-3993-0
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DOI: https://doi.org/10.1007/s10008-018-3993-0