Abstract
The investigation of the temperature dependence of the dark electrical conductivity of as grown LiTaO3 single crystals and the crystals reduced in vacuum was carried out. The reducing of the LT in vacuum at 830 K causes a removal diffusion of hydrogen and a partial loss of oxygen. It leads to recharging of transition metal impurities to the lowest valence state and blocking of hopping electronic conductivity. After filling of electronic traps, the process of small polaron formation takes place.
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