Composition-induced structural phase transitions in the (Ba 1-x La x ) 2 In 2 O 5+x (0≤x≤0.6) system

C. Tenailleau, A. Pring, S. M. Moussa, Y. Liu, R. L. Withers, S. Tarantino, M. Zhang, M. A. Carpenter

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18 Citations (Scopus)

Abstract

Composition-induced structural phase changes across the high temperature, fast oxide ion conducting (Ba 1-x La x ) 2 In 2 O 5+x , 0≤x≤0.6, system have been carefully analysed using hard mode infrared (IR) powder absorption spectroscopy, X-ray powder diffraction and electron diffraction. An orthorhombic brownmillerite to three-dimensionally disordered cubic perovskite phase transition in this system is signalled by a drastic change in slope of both wavenumber and average line widths of IR spectra as a function of composition. Some evidence is found for the existence of an intermediate tetragonal phase (previously reported to exist from electron diffraction data) around x∼0.2. The new spectroscopic data have been used to compare microscopic and macroscopic strain parameters arising from variation in composition. The strain and spectroscopic data are consistent with first-order character for the tetragonal→orthorhombic transition, while the cubic→tetragonal transition could be continuous. Differences between the variation with composition of spectral parameters and of macroscopic strain parameters are consistent with a substantial order/disorder component for the transitions. There is also evidence for precursor effects within the cubic structure before symmetry is broken.

Original languageEnglish
Pages (from-to)882-891
Number of pages10
JournalJournal of Solid State Chemistry
Volume178
Issue number3
DOIs
Publication statusPublished - 1 Mar 2005
Externally publishedYes

Keywords

  • (Ba La ) In O solid solution
  • Autocorrelation analysis
  • Electron diffraction
  • IR powder absorption spectroscopy
  • Perovskites
  • Phase transition
  • Strains

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