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Phase Transformations and Electrical Properties of Bismuth Sesquioxide

Tipo de material: TextoTextoSeries ; The Journal of Physical Chemistry, 73(3), p.672-675, 1973Trabajos contenidos:
  • Rao, C. N. R
  • Subba Rao, G. V
  • Ramdas
Recursos en línea: Resumen: Phase transformations of BieOs have been studied by differential thermal analysis. The enthalpy and activation energy of the monoclinic-cubic transformation are 8.8 and 110 kcal mol-', respectively. The enthalpies of the cubic-tetragonal and tetragonal-monoclinic transformations are estimated to be 6.7 and 2.1 kea1 mol-'. The electrical conductivity of BiiOs shows marked changes in conductivity at temperatures where the phase transformations occur. In addition, Bi203 shows a change in slope in the log a-l/T curve due to a change from p-type to n-type behavior; this observation is supported by the change in sign of the Seebeck coefficient, p, around the same temperature. /3 changes sign at lower temperatures as the oxygen partial pressure is reduced. The band model seems to be applicable in the case of BieOa.
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Phase transformations of BieOs have been studied by differential thermal analysis. The enthalpy and activation energy of the monoclinic-cubic transformation are 8.8 and 110 kcal mol-', respectively. The enthalpies of the cubic-tetragonal and tetragonal-monoclinic transformations are estimated to be 6.7 and 2.1 kea1 mol-'. The electrical conductivity of BiiOs shows marked changes in conductivity at temperatures where the phase transformations occur. In addition, Bi203 shows a change in slope in the log a-l/T curve due to a change from p-type to n-type behavior; this observation is supported by the change in sign of the Seebeck coefficient, p, around the same temperature. /3 changes sign at lower temperatures as the oxygen partial pressure is reduced. The band model seems to be applicable in the case of BieOa.

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