Superionic conductivity in TlGaTe2 crystals

Temperature dependences of electrical conductivity σ( T ) and permittivity ɛ( T ) of one-dimensional (1D) TlGaTe 2 single crystals are investigated. At temperatures higher than 305 K, superionic conductivity of the TlGaTe 2 is observed and is related to diffusion of Tl + ions via vacancies in the th...

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Published inSemiconductors (Woodbury, N.Y.) Vol. 45; no. 8; pp. 975 - 979
Main Authors Sardarli, R. M., Samedov, O. A., Abdullayev, A. P., Huseynov, E. K., Qocayev, E. M., Salmanov, F. T.
Format Journal Article
LanguageEnglish
Published Dordrecht SP MAIK Nauka/Interperiodica 01.08.2011
Subjects
Electronic Properties of Semiconductors
Magnetic Materials
Magnetism
Physics
Physics and Astronomy
Azerbaijan
Dielectric Anomaly
Ionic Conductivity
Superionic Conductivity
Frenkel Defect
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Summary:Temperature dependences of electrical conductivity σ( T ) and permittivity ɛ( T ) of one-dimensional (1D) TlGaTe 2 single crystals are investigated. At temperatures higher than 305 K, superionic conductivity of the TlGaTe 2 is observed and is related to diffusion of Tl + ions via vacancies in the thallium sublattice between (Ga 3+ Te 2 2− − nanochains. A relaxation character of dielectric anomalies is established, which suggests the existence of electric charges weakly bound to the crystal lattice. Upon the transition to the superionic state, relaxors in the TlGaTe 2 crystals are Tl + dipoles ((Ga 3+ Te 2 2− ) − chains) that arise due to melting of the thallium sublattice and hops of Tl + ions from one localized state to another. The effect of a field-induced transition of the TlGaTe 2 crystal to the superionic state is detected.
ISSN:1063-7826
1090-6479
DOI:10.1134/S1063782611080161