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Interrelation of structural features and vibrational dynamics of atoms in the crystal lattice of lithium orthogermanate in the superionic state

  • Lattice Dynamics and Phase Transitions
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Abstract

The crystal structure and vibrational dynamics of lithium atoms in Li3.75Ge0.75V0.25O4 and Li3.70Ge0.85W0.15O4 solid electrolytes in the superionic state are investigated using neutron diffraction and nuclear magnetic resonance (NMR) spectroscopy. It is found that, in the crystal lattice, lithium ions occupy four nonequivalent positions in the tetrahedral and octahedral oxygen ion environment with vacancies in the octahedra. These findings are in good agreement with the NMR data on the dynamic inhomogeneity of lithium cations in the lattice. It is shown that the origin of the superionic state in the studied compounds is associated primarily with the geometric factor, i.e., with an increase in the size of cavities in the oxygen polyhedra surrounding lithium cations.

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Authors and Affiliations

  1. Institute of Metal Physics, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoi 18, Yekaterinburg, 620219, Russia

    V. I. Voronin, A. P. Stepanov, I. F. Berger, L. Z. Akhtyamova & A. L. Buzlukov

  2. Institute of High-Temperature Electrochemistry, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoi 20, Yekaterinburg, 620219, Russia

    G. Sh. Shekhtman & E. I. Burmakin

Authors
  1. V. I. Voronin
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  2. A. P. Stepanov
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  3. I. F. Berger
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  4. L. Z. Akhtyamova
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  5. A. L. Buzlukov
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  6. G. Sh. Shekhtman
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  7. E. I. Burmakin
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__________

Translated from Fizika Tverdogo Tela, Vol. 45, No. 8, 2003, pp. 1475–1481.

Original Russian Text Copyright © 2003 by Voronin, Stepanov, Berger, Akhtyamova, Buzlukov, Shekhtman, Burmakin.

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Voronin, V.I., Stepanov, A.P., Berger, I.F. et al. Interrelation of structural features and vibrational dynamics of atoms in the crystal lattice of lithium orthogermanate in the superionic state. Phys. Solid State 45, 1549–1556 (2003). https://doi.org/10.1134/1.1602895

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  • DOI: https://doi.org/10.1134/1.1602895

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