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Lattice dynamic investigation of Raman and infrared wavenumbers at the zone center of orthorhombic RFeO 3 (R = Tb, Dy, Ho, Er, Tm) perovskites
Author(s) -
Gupta H. C.,
Kumar Singh Manoj,
Tiwari L. M.
Publication year - 2002
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.805
Subject(s) - orthorhombic crystal system , raman spectroscopy , infrared , wavenumber , force constant , phonon , chemistry , lattice constant , ion , lattice (music) , condensed matter physics , materials science , analytical chemistry (journal) , crystallography , crystal structure , physics , optics , molecule , diffraction , acoustics , organic chemistry , chromatography
A short‐range force constant model was applied for the first time to investigate the phonons in RFeO 3 ( R = Tb , Dy, Ho, Er, Tm) perovskites in the orthorhombic phase. The calculations with the 12 stretching and three bending force constants provide good agreement for the observed Raman and infrared wavenumbers. The infrared wavenumbers were assigned for the first time. The variation of the force constants on going from Tb to Tm is discussed . The effect of changing the R ion from Tb to Tm in the Raman modes of RFeO 3 is also discussed. Copyright © 2002 John Wiley & Sons, Ltd.