Formation enthalpies of LaLnO3 (Ln=Ho, Er, Tm and Yb) interlanthanide perovskites

Jianqi Qi, Xiaofeng Guo, Aleksandra Mielewczyk-Gryn, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

High-temperature oxide melt solution calorimetry using 3Na2O·MoO3 at 802 °C was performed for interlanthanide perovskites LaLnO3 (Ln=Ho, Er, Tm and Yb) and lanthanide oxides (La2O3, Ho2O3, Er2O3, Tm2O3 and Yb2O3). The enthalpies of formation of these interlanthanide perovskites from binary lanthanide oxides at room temperature (25 °C) were determined to be -8.3±3.4 kJ/mol for LaHoO3, -9.9±3.0 kJ/mol for LaErO3, -10.8±2.7 kJ/mol for LaTmO3 and -12.3±2.9 kJ/mol for LaYbO3. There is a roughly linear relationships between these enthalpy values and the tolerance factor for these and for other LaM3+O3 (M=In, Sc, Ga, Al, Fe and Cr) perovskites, confirming that the distortion of the perovskites as results from ionic radius difference of A-site and B-site cations, is the main factor determining the stability of these compounds.

Original languageEnglish (US)
Pages (from-to)150-154
Number of pages5
JournalJournal of Solid State Chemistry
Volume227
DOIs
StatePublished - Jul 1 2015
Externally publishedYes

Keywords

  • Calorimetry
  • Enthalpy of formation
  • Lanthanide
  • Perovskite

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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