Influence of antimony substitution on spontaneous strain and thermodynamic stability of lanthanum orthoniobate

A. Mielewczyk-Gryn, S. Wachowski, K. I. Lilova, X. Guo, M. Gazda, A. Navrotsky

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Analysis of the influence of antimony substitution on the temperature dependence of unit cell distortion in lanthanum orthoniobate has been performed. The values of spontaneous strain and Landau order parameter for three different antimony contents have been calculated. The monoclinic-tetragonal phase transition occurring for antimony substituted lanthanum orthoniobate was found to be of the second order. High temperature oxide melt solution calorimetry has shown that antimony substitution has little influence on the stability of the monoclinic phase. The average value of enthalpy of formation of antimony substituted lanthanum orthoniobate with fergusonite structure is -132.0±0.8 kJ/mol, and that of scheelite structure is -126.4±1.5 kJ/mol, implying greater stability for the former polymorph.

Original languageEnglish (US)
Pages (from-to)2128-2133
Number of pages6
JournalCeramics International
Volume41
Issue number2
DOIs
StatePublished - Mar 1 2015
Externally publishedYes

Keywords

  • Enthalpy of formation
  • Landau order parameter
  • Lanthanum orthoniobate
  • Spontaneous strain

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Influence of antimony substitution on spontaneous strain and thermodynamic stability of lanthanum orthoniobate'. Together they form a unique fingerprint.

Cite this