Lattice dynamic investigation of the zone center wavenumbers of the cubic A(2)Ti(2)O(7) pyrochlores

Authors
Gupta, HC Brown, S Rani, N Gohel, VB
Citation
Hc. Gupta et al., Lattice dynamic investigation of the zone center wavenumbers of the cubic A(2)Ti(2)O(7) pyrochlores, J RAMAN SP, 32(1), 2001, pp. 41-44
Citations number
5
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences
Journal title
JOURNAL OF RAMAN SPECTROSCOPY
ISSN journal
03770486 → ACNP
Volume
32
Issue
1
Year of publication
2001
Pages
41 - 44
Database
ISI
SICI code
0377-0486(200101)32:1<41:LDIOTZ>2.0.ZU;2-A
Abstract
A short-range force constant model was applied for the first time to invest igate the phonons in A(2)Ti(2)O(7) (A = Y, Sm, Gd, Yb) pyrochlores in their cubic phase of space group Fd(3) over barm. The calculations of phonons we re made with five stretching and four bending force constants. The calculat ed values of Raman and infrared wavenumbers are in good agreement with the observed values. Copyright (C) 2001 John Wiley & Sons, Ltd.