Thermal evolution of the crystal structure of the orthorhombic perovskite LaFeO3

Charlotte A.L. Dixon, Christopher M. Kavanagh, Kevin S. Knight, Winfried Kockelmann, Finlay D. Morrison, Philip Lightfoot

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25 Citations (Scopus)
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Abstract

The thermal evolution of the crystal structure of the prototypical orthorhombic perovskite LaFeO3 has been studied in detail by powder neutron diffraction in the temperature range 25<T<1285 K. A conventional bond length/bond angle analysis, combined with an analysis in terms of symmetry-adapted modes, allows key aspects of the thermal behavior to be understood. In particular, the largest-amplitude symmetry modes (viz. in-phase and out-of-phase octahedral tilts, and A-site cation displacements) are shown to display relatively ‘normal’ behavior, increasing with decreasing temperature, which contrasts with the anomalous behavior previously shown by the derivative Bi0.5La0.5FeO3. However, an unexpected behavior is seen in the nature of the intra-octahedral distortion, which is used to rationalize the unique occurrence of a temperature dependent crossover of the a and c unit cell metrics in this compound.

Original languageEnglish
Pages (from-to)337-342
JournalJournal of Solid State Chemistry
Volume230
Early online date17 Jul 2015
DOIs
Publication statusPublished - Oct 2015

Keywords

  • LaFeO3
  • Perovskite
  • Symmetry mode analysis
  • Powder neutron diffraction

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