Defect chemistry and semiconducting properties of calcium titanate

M. F. Zhou; T. Bak; J. Nowotny; M. Rekas; C. C. Sorrell; E. R. Vance

doi:10.1023/A:1021552602704

Defect chemistry and semiconducting properties of calcium titanate

M. F. Zhou, T. Bak, J. Nowotny, M. Rekas, C. C. Sorrell, E. R. Vance

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Abstract

The present paper considers the effect of oxygen partial pressure on the presence of point defects in calcium titanate (CaTi0₃) at elevated temperatures at which a gas/solid equilibrium is reached. Defect models of undoped (CaTiO₃) are considered within several regimes of oxygen partial pressures involving (i) extremely reducing conditions, (ii) reducing conditions, and (iii) oxidizing conditions, which are described by different charge-neutrality conditions. The mechanism of donor incorporation is considered in terms of both ionic and electronic charge compensation. It is shown that electronic and ionic charge compensations prevail at low and high p(0₂), respectively.

Original language	English
Pages (from-to)	697-704
Number of pages	8
Journal	Journal of Materials Science: Materials in Electronics
Volume	13
Issue number	12
DOIs	https://doi.org/10.1023/A:1021552602704
Publication status	Published - Dec 2002
Externally published	Yes

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AU - Zhou, M. F.

AU - Bak, T.

AU - Nowotny, J.

AU - Rekas, M.

AU - Sorrell, C. C.

AU - Vance, E. R.

PY - 2002/12

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AB - The present paper considers the effect of oxygen partial pressure on the presence of point defects in calcium titanate (CaTi03) at elevated temperatures at which a gas/solid equilibrium is reached. Defect models of undoped (CaTiO3) are considered within several regimes of oxygen partial pressures involving (i) extremely reducing conditions, (ii) reducing conditions, and (iii) oxidizing conditions, which are described by different charge-neutrality conditions. The mechanism of donor incorporation is considered in terms of both ionic and electronic charge compensation. It is shown that electronic and ionic charge compensations prevail at low and high p(02), respectively.

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Defect chemistry and semiconducting properties of calcium titanate

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