Direct measurements of fusion and phase transition enthalpies in lanthanum oxide

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19 Scopus citations

Abstract

Enthalpies of high-temperature phase transitions and fusion in lanthanum oxide (La2O3) were directly measured for the first time. Three samples were prepared by laser melting, sealed in tungsten crucibles, and heated in a differential thermal analyzer calibrated by melting Al 2O3. Transformation enthalpy of La2O 3 from A to H phase is 23 ± 5 kJ/mol at 2046 ± 5 °C and from H to X phase is 17 ± 5 kJ/mol at 2114 ± 5 °C. Lanthanum oxide melts at 2301 ± 10 °C, with enthalpy of fusion of 78 ± 10 kJ/mol.

Original languageEnglish (US)
Pages (from-to)845-847
Number of pages3
JournalJournal of Materials Research
Volume26
Issue number7
DOIs
StatePublished - Apr 14 2011
Externally publishedYes

Keywords

  • Calorimetry
  • Phase Equilibria
  • Phase Transformation

ASJC Scopus subject areas

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

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