Electrical Conduction in Reduced Single Crystals of Barium Titanate

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<jats:p> Temperature dependence of electrical conductivity and Hall effect of the barium-titanate crystals reduced by hydrogen were studied at temperatures -195∼165°C. The hydrogen reduction was carried out at above 800°C. The optical absorption in the reduced crystals was observed. Electron spin resonance absorption due to oxygen vacancy with a captured electron was observed in the slightly reduced crystals. Thermal activation energies obtained from temperature dependence of electrical conductivity showed different values in each phase of BaTiO<jats:sub>3</jats:sub> crystal. Carrier concentration calculated from Hall coefficient is 10<jats:sup>17</jats:sup>∼10<jats:sup>19</jats:sup>/cc and Hall mobility ranges from 10<jats:sup>-2</jats:sup> to 1 cm<jats:sup>2</jats:sup> v<jats:sup>-1</jats:sup>·s<jats:sup>-1</jats:sup> at room temperature. A hydrogen-atom-like model is proposed for the captured electron in oxygen vacancy in the reduced barium-titanate crystals. The electrical conduction seems to be reasonably explained by a band model theory. </jats:p>

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