Semiconductive Single Crystal of BaTizO_3 Reduced in Hydrogen Atmosphere

概要

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The electrical resistivity, optical transmission, effects of chemical etching, Hall effect, thermoelectric force and electron spin resonance have been studied on single crystals of BaTi0_3 reduced for five hours at temperatures from 400 to 1OOO℃ in a hydrogen atmosphere. The reduction treatment causes a lowering of the resistivity, and enhancement of the infrared absorption centered at 2.3μ and a visible absorption near the optical absorption edge. The single crystals are not always reduced homogeneously. The resistivity of a homogeneously reduced crystal changes abruptly at the three transition temperatures. The sign of the Hall coefficient and the thermoelectric power indicates that the charge carriers in the reduced crystals are electrons. On the basis of the results obtained, a tentative model is proposed for defects in the reduced single crystal.
社団法人日本物理学会の論文
1964-02-05