Formation enthalpies and heat capacities of rear earth titanates: RE 2TiO 5 (RE=La, Nd and Gd)

Shmuel Hayun, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

The formation enthalpies and heat capacities of orthorhombic rare earth titanates, RE 2TiO 5 (RE=La, Nd and Gd), have been studied by high temperature differential scanning calorimetry (3001473 K) and oxide-melt solution calorimetry. The RE 2TiO 5 samples are stable in enthalpy with respect to their oxides and the pyrochlore RE 2Ti 2O 7 phase. The general trend that has been demonstrated in other RE-ternary systems; decreasing thermodynamic stability with decreasing R A/R B was found to be valid for the RE 2TiO 5, and their enthalpies of formation from oxides become more negative with increasing RE 3 ionic radius.

Original languageEnglish
Pages (from-to)70-74
Number of pages5
JournalJournal of Solid State Chemistry
Volume187
DOIs
StatePublished - 1 Mar 2012

Keywords

  • Formation enthalpy
  • Heat capacity
  • Rear earth titanates

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