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Oscillating, relaxating, and translating mobility of Li+ ions in the LiNbGeO5 monocrystal

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Abstract

Dielectric properties of single crystals of LiNbGeO5, crystallizing in the andalusite (β-Al2SiO5) structure, have been studied. Dielectric and conducting properties along the major crystallographic axes were investigated at frequencies from 1 to 1000 kHz and in the range of temperatures between 100 and 600 K. Determined potential barriers between the equilibrium positions of Li+ ions are classified as low energy (0.23-0.79 eV, along the a axis) and high energy (0.9-1.90 eV, along the a, b, and c axes). Additional interstitial sites with the distances between them 0.3-0.4 Å have been found along the a axis, while no such sites observed along the b and c axes. Activation energy (Ea) in the direction a is 0.47 eV and ?a(570 K) = 2.10-5 S/cm, which correspond to the super-ionic conductivity.

About the Authors

S. Y. Stefanovich
МГУ им. М.В. Ломоносова
Russian Federation


V. V. Fomitchyov
M.V. Lomonosov Moscow State University of Fine Chemical Technologies, 86, Vernadskogo pr., Moscow 119571
Russian Federation


V. V. Konovalova
M.V. Lomonosov Moscow State University of Fine Chemical Technologies, 86, Vernadskogo pr., Moscow 119571
Russian Federation


A. V. Mosunov
РНЦ НИФХИ им Л.Я. Карпова
Russian Federation


B. V. Mill
МГУ им. М.В. Ломоносова
Russian Federation


References

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For citation:


Stefanovich S.Y., Fomitchyov V.V., Konovalova V.V., Mosunov A.V., Mill B.V. Oscillating, relaxating, and translating mobility of Li+ ions in the LiNbGeO5 monocrystal. Fine Chemical Technologies. 2009;4(1):88-94. (In Russ.)

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ISSN 2410-6593 (Print)
ISSN 2686-7575 (Online)