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Raman scattering investigation of lead mixed halides, PbCl 2 x Br 2(1 − x ) , as a function of the proportion × ϵ [0, 1]
Author(s) -
CarabatosNédelec C.,
Lumbreras M.
Publication year - 1990
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.1250210503
Subject(s) - raman spectroscopy , raman scattering , phonon , halide , lattice (music) , chemistry , lattice vibration , analytical chemistry (journal) , ion , x ray crystallography , crystallography , condensed matter physics , diffraction , physics , inorganic chemistry , optics , organic chemistry , chromatography , acoustics
PbCl 2 x Br 2(1 − x ) single crystals for various compositions were studied by Raman spectroscopy at 14 K. It is shown that the phonons are of one‐ or two‐mode behaviour when the proportion x varies from 0 to 1. Lattice dynamic and group theory considerations related to structural data allow one to establish a mechanism for the substitutional filling of the anion sites and their participation in the lattice vibrations, the frequency of which has been measured as a function of x at 14 K. The maximum disorder given by the Raman line widths occurs for x = 0.25 and x = 0.75, in accordance with dielectric measurements.