Phase transition in Ba{sub 2}In{sub 2}O{sub 5} studied by in situ high temperature X-ray diffraction using synchrotron radiation
- Instituto de Pesquisas Energeticas e Nucleares, R. do Matao, Trav. R, 400 cidade Universitaria, S. Paulo, SP, 05508-000 (Brazil)
- Laboratorio Nacional de Luz Sincrotron (Brazil)
The order-disorder phase transition in Ba{sub 2}In{sub 2}O{sub 5} high-temperature ionic conductor was systematically studied by in situ high-temperature X-ray diffraction using synchrotron radiation and electrical conductivity. Pure barium indate was prepared by solid state reactions at 1300 deg. C. The room-temperature structural characterization showed a high degree of phase homogeneity in the prepared material. The reduction of the order-disorder phase transition temperature was verified by electrical conductivity and high-temperature X-ray diffraction. The observed features were explained based on Fourier-transform infrared spectroscopy results that revealed the presence of hydroxyl species in the crystal lattice. The increase of the intensity of few diffraction peaks near the phase transition temperature suggests the formation of a superstructure before the orthorhombic-to-tetragonal phase transition.
- OSTI ID:
- 21260225
- Journal Information:
- AIP Conference Proceedings, Vol. 1092, Issue 1; Conference: 6. international conference on synchrotron radiation in materials science, Campinas (Brazil), 20-23 Jul 2008; Other Information: DOI: 10.1063/1.3086214; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BARIUM
BARIUM OXIDES
ELECTRIC CONDUCTIVITY
ELECTRIC CONDUCTORS
FOURIER TRANSFORM SPECTROMETERS
HYDROXIDES
INDIUM OXIDES
ORDER-DISORDER TRANSFORMATIONS
ORTHORHOMBIC LATTICES
SYNCHROTRON RADIATION
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TRANSITION TEMPERATURE
X-RAY DIFFRACTION