Electrical Conduction in Reduced Single Crystals of Barium Titanate

概要

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Temperature dependence of electrical conductivity and Hall effect of the barium-titanate crystals reduced by hydrogen were studied at temperatures -195∼165℃. The hydrogen reduction was carried out at above 800℃. 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_3 crystal. Carrier concentration calculated from Hall coefficient is 10^<17>∼10^<19>/cc and Hall mobility ranges from 10^<-2> to 1 cm^2 v^<-1>・s^<-1> 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.
社団法人応用物理学会の論文
1967-04-15