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Lattice dynamic investigation of the phonon wavenumbers of BaCeO3 perovskite

✍ Scribed by H. C. Gupta; P. Ashdhir

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
102 KB
Volume
30
Category
Article
ISSN
0377-0486

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✦ Synopsis

A short-range force constant model was used to investigate the phonons in perovskite in the orthorhombic BaCeO 3 phase. The calculations with just 14 stretching and bending force constants provide good agreement for the Raman wavenumbers. The oxygen-oxygen interatomic forces are included explicitly for the Ðrst time in investigations of phonons.

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A short-range force constant model was applied to investigate the phonons in CaGeO 3 perovskite in the orthorhombic phase. The calculations with six stretching and bending force constants provide good agreement for the Raman wavenumbers. The correct assignments of the observed Raman wavenumbers were

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A high-pressure Raman study of BaCeO 3 was performed at room temperature. This perovskite compound undergoes two phase transitions at about 22 and 28 GPa. The increase in the number of bands is an indication that the symmetry is lowered and that the compound does not evolve towards the ideal cubic p