Formation enthalpies of tetravalent lanthanide perovskites by high temperature oxide melt solution calorimetry

S. V. Ushakov, J. Cheng, A. Navrotsky, J. R. Wu, S. M. Haile

Research output: Contribution to journalConference articlepeer-review

13 Scopus citations

Abstract

High-temperature oxide melt solution calorimetry was used to measure formation enthalpies for several compositions of perovskites of nominal stoichiometry BaPrO3 and BaCeO3. Samples were synthesized from chemical solution methods followed by calcination at 1100-1300 °C. PrO2 was synthesized by oxidation of Pr6O11 in an oxygen flow at 280 °C. The samples were characterized by microprobe, thermogravimetric and differential thermal analyses. Cell parameters were refined by the Rietveld method. Barium excess in the samples with respect to ideal stoichiometry was detected. Drop solution enthalpies were measured in a Calvet type twin microcalorimeter, using 3Na2Ȯ4MoO3 solvent at 702 °C. Preliminary values of the formation enthalpy of BaPrO3 and BaCeO3 from oxides were -70 ± 10 kJ/mol and -51 ± 10 kJ/mol, respectively. They fall on the normal trend of energetics versus Goldschmidt tolerance factor and do not show any special stabilization of BaPrO3 relative to other MLnO3 perovskites.

Original languageEnglish (US)
Pages (from-to)71-76
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume718
DOIs
StatePublished - 2002
Externally publishedYes
EventPerovskite Materials - San Francisco, CA, United States
Duration: Apr 1 2002Apr 5 2002

ASJC Scopus subject areas

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

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