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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

REFERENCES

1Goodenough, J. B., Ruiz-Diaz, J. E., and Zhen, Y. S., Solid State Ionics 44, 21 (1990).CrossRefGoogle Scholar
2Rao, C. N. R. and Gopalakrishnan, J., New Directions in Solid State Chemistry (Cambridge Univ. Press, 1986), p. 256.Google Scholar
3Lange, R. A., DeYoreo, J.J., and Navrotsky, A., Am. Mineralogist 76, 904 (1991).Google Scholar
4Robie, R. A., Hemingway, B. S., and Fisher, J. R., U.S. Geological Survey Bull., No. 145 2 (1978).Google Scholar
5Takano, M., personal communication.Google Scholar