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Raman spectroscopic results for order–disorder transitions of K 2 Ba(NO 2 ) 4
Author(s) -
Unruh H.G.
Publication year - 1986
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.1250170123
Subject(s) - raman spectroscopy , raman scattering , phase transition , soft modes , lattice (music) , chemistry , barium , coherent anti stokes raman spectroscopy , molecular physics , condensed matter physics , materials science , optics , physics , inorganic chemistry , optoelectronics , dielectric , acoustics , ferroelectricity
The temperature dependence of internal NO 2 modes has been investigated by polarized Raman scattering from potassium barium nitrite single crystals. The frequencies of the symmetric stretching and bending modes are determined for the three non‐equivalent NO 2 sites present at room temperature. The structural implications associated with the phase transition at about 200 K are derived from line splittings and relative intensities. The experimental results are consistent with an order–disorder transition and no soft lattice mode has been found.