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- W2093485306 abstract "Both electrical conductivity and thermopower were studied for undoped BaTiO3 single crystal in the temperature range 1090–1310 K under controlled gas atmosphere corresponding to the n-p type transition range. Reciprocals of the exponent of p(O2) determined from electrical conductivity (nδ) and thermopower (ns) were determined. The parameters nδ and ns assume about −4 and −4·1 for the n-type regime. Both nδ and ns assume about 5·3 in the p-type regime. These values were interpreted in terms of the defect models involving oxygen vacancies as pre-dominant defects in the n-type regime and Schottky-type defects in the p-type regime. The mobility ratio of electronic carriers was determined. Experimental data indicate that the small polaron (hopping mechanism) model rather than the band model is valid in the n-type regime. Present experimental data do not allow a conclusion on the transport mechanism in the p-type regime. It was shown that the width of the forbidden gap for undoped BaTiO3 is the following function of temperature: Eg(T) = E0−βT where E0 = 2·9 eV. The parameters β assumes 3·2 × 10−5 and 2·47 × 10−4 for the hopping and the band models, respectively." @default.
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- W2093485306 date "1994-01-01" @default.
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- W2093485306 title "Defect structure, electrical properties and transport in barium titanate. III. Electrical conductivity, thermopower and transport in single crystalline BaTiO3" @default.
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- W2093485306 doi "https://doi.org/10.1016/0272-8842(94)90057-4" @default.
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