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Raman scattering investigation of cesium plumbochloride, CsPbCl 3 , phase transitions
Author(s) -
CarabatosNédelec C.,
Oussaïd M.,
Nitsch K.
Publication year - 2003
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.1005
Subject(s) - raman spectroscopy , orthorhombic crystal system , phase transition , chemistry , raman scattering , monoclinic crystal system , tetragonal crystal system , debye , phase (matter) , scattering , infrared , relaxation (psychology) , condensed matter physics , crystallography , molecular physics , crystal structure , physics , optics , psychology , social psychology , organic chemistry
We report a Raman scattering investigation of CsPbCl 3 as a function of temperature in four different scattering configurations allowing us to obtain the various irreducible representations of the appropriate symmetry groups describing the substance in its successive phase transitions: cubic, tetragonal, orthorhombic and monoclinic or orthorhombic. We identify the correct ‘parentage’ of the observed modes with respect to infrared reflectivity data reported in the literature in accord with the Lyddane–Sachs–Teller relation, which was not fulfilled in previous assignments. We demonstrate the presence of strong correlation chains, which maintain the compound in a pseudo‐cubic state as far as x‐ray, infrared and Raman spectroscopy are concerned. The intensity of the related central peak was analysed on the basis of a Debye‐type relaxation as a function of temperature; the results show perfect correspondence of its variations and the temperatures of the phase transitions. In addition, an order–disorder phase transition is evidenced at low temperature, 193 K (−80 °C). Copyright © 2003 John Wiley & Sons, Ltd.