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090			_aB-12963
245	1	0	_aPhase Transformations and Electrical Properties of Bismuth Sesquioxide
490	0		_vThe Journal of Physical Chemistry, 73(3), p.672-675, 1973
520	3		_aPhase 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.
700	1	2	_aRao, C. N. R.
700	1	2	_aSubba Rao, G. V.
700	1	2	_aRamdas
856	4	0	_uhttps://drive.google.com/file/d/1rH8pZjN4mOK1fZcOxx6l6CQKjRpHlBt-/view?usp=drivesdk _zPara ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx
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