Energetics of the oxygen vacancy order-disorder transition in Ba2ln2O5

T. R.S. Prasanna, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

The heat capacity and the enthalpy associated with the reported oxygen vacancy order-disorder transition in Ba2In2O5were 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.

Original languageEnglish (US)
Pages (from-to)1484-1486
Number of pages3
JournalJournal of Materials Research
Volume8
Issue number7
DOIs
StatePublished - Jul 1993
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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