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  1. 1 Acta Physica Polonica A

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  1. 1 2018

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  1. 1 Agarkov K.

  2. 1 Sadovskaya L.

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Conductivity Effects in Bi₂TeO₅ Single Crystals

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Agarkov K., Sadovskaya L.
Acta Physica Polonica A
|
2018
|
vol. 133
|
issue 4
940-942
EN
The current-voltage characteristics (I-V) of non-stoichiometric bismuth tellurite crystals were studied in a range of temperatures from 150°C to 350°C and fields up to 2.5 kV/cm with asymmetric contacts (In-Ga eutectic and Na₂SiO₃). The I-V curves and observed monopolar injection are described by the approximation of space charge limited currents. In the composition of 47% Bi₂O₃-53% TeO₂ electronic conduction is prevailed. In the composition 43% Bi₂O₃-57% TeO₂ the conductivity is contributed by electrons and holes. The spectrum of local states in the band gap of the studied crystals is quasicontinuous, which cannot be described by models of a discrete or exponential distribution.
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