Lattice dynamics of tetragonal R2BaCuO5 (R = La, Nd) oxides in the P4/mbm structure
β Scribed by H. C. Gupta; V. Sharma
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 184 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0377-0486
- DOI
- 10.1002/jrs.1737
No coin nor oath required. For personal study only.
π SIMILAR VOLUMES
## Abstract A shortβrange force constant model has been applied to investigate the Raman and the infrared wavenumbers in R~2~BaNiO~5~ (R = Y, Gd) in their orthorhombic phase of space group __Immm__. Calculations of zoneβcenter phonons are made with seven stretching and four bending force constants.
X-ray crystallographic analyses are reported for the two title compounds (8 and 9), of which the former crystallized in two modifications (8n and 8b). In all three structures, the pyranose rings have the %, (D) conformation and the substituents at C-l are axial and those at C-24-4 are equatorial. Th