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Energetics of the oxygen vacancy order-disorder transition in Ba2In2O5

Published online by Cambridge University Press:  31 January 2011

T.R.S. Prasanna  and
Alexandra Navrotsky
T.R.S. Prasanna
Affiliation:
Department of Geological and Geophysical Sciences and Princeton Materials Institute, Princeton University, Princeton, New Jersey 08544
Alexandra Navrotsky
Affiliation:
Department of Geological and Geophysical Sciences and Princeton Materials Institute, Princeton University, Princeton, New Jersey 08544
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Abstract

The heat capacity and the enthalpy associated with the reported oxygen vacancy order-disorder transition in Ba2In2O5 were measured by high temperature step scanning calorimetry. The transition temperature is 1205 ± 2 K. The transition appears first order or nearly so. The enthalpy and entropy of transition are 1.3 kJ/mol and 1.1 J/mol K, respectively. The latter is only 4.8% of the configurational entropy, arising from mixing one vacancy and five oxygens per formula unit, 22.5 J/mol K. This suggests that the transition involves only a small fraction of the oxygen vacancies and implies extensive short-range order, SRO, in the high temperature phase.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 8 , Issue 7 , July 1993 , pp. 1484 - 1486
Copyright
Copyright © Materials Research Society 1993

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References

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