Conductivity Effects in Bi2TeO5 Single Crystals
K.V. Agarkov and L.Ya. Sadovskaya
Oles Honchar National University, 49010, Dnipro, Ukraine
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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.

DOI: 10.12693/APhysPolA.133.914
PACS numbers: 72.20.Jv