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Raman study and lattice dynamics calculation of the misfit layer compound (PbS) 1.12 VS 2
Author(s) -
Sourisseau C.,
Cavagnat R.,
Fouassier M.,
Tirado J. L.,
Morales J.
Publication year - 1995
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.1250260814
Subject(s) - raman spectroscopy , lattice (music) , raman scattering , laser , materials science , chemistry , crystal structure , crystallography , analytical chemistry (journal) , molecular physics , optics , physics , organic chemistry , acoustics
The UV—visible (340—800 nm) and Raman spectra (10—900 cm −1 ) obtained using various laser exciting radiation of a powder sample of the misfit compound (PbS) 1.12 VS 2 were investigated. In agreement with x‐ray data, vibrational assignments are proposed for most of the internal and external modes of the ‘PBS’ and ‘VS 2 ’ layered sublattices and they were extensively compared with those in the related titanium‐containing compound in order to appreciate the interactions due to the ‘PbS’ donor part of the structure. Owing to the incommensurate structure of (PbS) 1.12 VS 2 , new slightly resonance exhanced Raman signals are detected and they can be explained by the k = O, ± q * selection rules ( q * is the modulation vector) as in a previous study of (SnS) 1.17 NbS 2 and (PbS) 1.18 TiS 2 compounds. These observations are again confirmed by lattice dynamics calculations which reproduce the essential features of the experimental data and allow one to estimate the strength of interlayer interactions.