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Raman spectrum and dielectric relaxation in K 4 Fe(CN) 6 · 3 H 2 O
Author(s) -
Savatinova I.,
Anachkova E.
Publication year - 1977
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220840143
Subject(s) - dielectric , raman spectroscopy , relaxation (psychology) , condensed matter physics , chemistry , phase transition , nuclear magnetic resonance , materials science , physics , optics , quantum mechanics , psychology , social psychology
The temperature dependence of the two Raman active modes at 62 and 126 cm −1 corresponding to the symmetry B g /A″ (z) is investigated. In the vicinity of the phase transition point ( T C = 249 K) the mode bandwidths undergo a sharp increase which is assigned to the reduction of the barrier height characterizing the water Brownian motion. A semi‐empirical expression for the temperature dependence of the barrier height is given. Mason's relaxation theory is used to correlate the temperature behaviour of the barrier with the dielectric constant of KFCT as function of temperature and frequency.