The structure of the oxide ion conductor La0.9Sr0.1Ga0.8Mg0.2O2.85 by powder neutron diffraction

P. R. Slater, J. T.S. Irvine, T. Ishihara, Y. Takita

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High resolution powder neutron diffraction has shown that the room temperature structure of the new fast oxide ion conducting solid electrolyte La0.9Sr0.1Ga0.8Mg0.2O2.85 is monoclinic, rather than orthorhombic, as for the undoped parent phase LaGaO3. In both systems the main distortion of the structure from the ideal perovskite is the tilting of the GaO6 octahedra, and the symmetry change has a direct effect on this tilting, such that for LaGaO3 the [001]p tilt is in-phase when successive octahedra are considered, while for La0.9Sr0.1Ga0.8Mg0.2O2.85 it is antiphase. The degree of tilting of the octahedra is also reduced by the doping. For this room temperature data, the oxygen vacancies in La0.9Sr0.1Ga0.8Mg0.2O2.85 are shown to be preferentially located in the apical sites.

Original languageEnglish
Pages (from-to)319-323
Number of pages5
JournalSolid State Ionics
Issue number3-4
Publication statusPublished - Apr 1 1998
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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