High-Temperature Powder Neutron Diffraction Study of the Oxide Ion Conductor La0.9Sr0.1Ga0.8Mg0.2O2.85

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

Research output: Contribution to journalArticle

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Abstract

Powder neutron diffraction data have been collected between room temperature and 1000°C for the oxide ion conductor La0.9Sr0.1Ga0.8Mg0.2O 2.85and the undoped parent phase LaGaO3. In agreement with previous studies, refinement of the data for the undoped phase showed that the cell is orthorhombic (Pbnm) at room temperature and rhombohedral (R3c) between 250 and 1000°C. The structure of the doped system La0.9Sr0.1Ga0.8Mg0.2O 2.85is, however, significantly different from that of pure LaGaO3. The room temperature structure is monoclinic (I2/a), and there appear to be two phase transitions between 250 and 1000°C: monoclinic (pseudo-orthorhombic)→monoclinic (pseudo-rhombohedral)→rhombohedral. Significant changes are also seen in the GaO6octahedra on doping LaGaO3. In particular, the octahedra are substantially more distorted in the doped phase. The tilting of the octahedra is smaller for the doped phase and the degree of tilting is reduced as the temperature is raised. Possible correlation between the tilting of the octahedra and the activation energy for oxide ion conduction is presented.

Original languageEnglish
Pages (from-to)135-143
Number of pages9
JournalJournal of Solid State Chemistry
Volume139
Issue number1
DOIs
Publication statusPublished - Aug 1 1998
Externally publishedYes

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Neutron powder diffraction
Oxides
neutron diffraction
conductors
Ions
oxides
room temperature
ions
Temperature
activation energy
conduction
Activation energy
Phase transitions
Doping (additives)
cells
temperature

All Science Journal Classification (ASJC) codes

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

Cite this

High-Temperature Powder Neutron Diffraction Study of the Oxide Ion Conductor La0.9Sr0.1Ga0.8Mg0.2O2.85 . / Slater, P. R.; Irvine, J. T.S.; Ishihara, Tatsumi; Takita, Y.

In: Journal of Solid State Chemistry, Vol. 139, No. 1, 01.08.1998, p. 135-143.

Research output: Contribution to journalArticle

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AB - Powder neutron diffraction data have been collected between room temperature and 1000°C for the oxide ion conductor La0.9Sr0.1Ga0.8Mg0.2O 2.85and the undoped parent phase LaGaO3. In agreement with previous studies, refinement of the data for the undoped phase showed that the cell is orthorhombic (Pbnm) at room temperature and rhombohedral (R3c) between 250 and 1000°C. The structure of the doped system La0.9Sr0.1Ga0.8Mg0.2O 2.85is, however, significantly different from that of pure LaGaO3. The room temperature structure is monoclinic (I2/a), and there appear to be two phase transitions between 250 and 1000°C: monoclinic (pseudo-orthorhombic)→monoclinic (pseudo-rhombohedral)→rhombohedral. Significant changes are also seen in the GaO6octahedra on doping LaGaO3. In particular, the octahedra are substantially more distorted in the doped phase. The tilting of the octahedra is smaller for the doped phase and the degree of tilting is reduced as the temperature is raised. Possible correlation between the tilting of the octahedra and the activation energy for oxide ion conduction is presented.

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