Raman and infrared study of ferroelectric thiourea and rochelle salt
- 1 January 1980
- journal article
- Published by Taylor & Francis in Ferroelectrics
- Vol. 25 (1) , 613-616
- https://doi.org/10.1080/00150198008207083
Abstract
We have observed the optical phonon modes in thiourea and Rochelle salt single crystals by means of polarized Raman and infrared spectroscopy. The spectra were recorded at several temperatures especially near the various phase transition points which are known to exist in both materials. The intention was to search for characteristic changes in the spectra near the transition temperatures. The observed frequency shifts and anomalous line broadening can be interpreted within the framework of a generalized pseudospin-phonon interaction first developped for the TGS-family1. We also discuss the observed intensity changes by applying a group theoretical method developped by Petzelt and Dvorak2.Keywords
This publication has 5 references indexed in Scilit:
- Successive Phase Transitions in Ferroelectric NaNO2 and SC(NH2)2Journal of the Physics Society Japan, 1978
- Changes of infrared and Raman spectra induced by structural phase transitions. I. General considerationsJournal of Physics C: Solid State Physics, 1976
- Changes of infrared and Raman spectra induced by structural phase transitions. II. ExamplesJournal of Physics C: Solid State Physics, 1976
- Temperature behaviour of optical phonons near Tc in ferroelectric triglycine sulfateand triglycine selenate-evidence of non-linear pseudospin-phonon interactionFerroelectrics, 1976
- On the Molecular Nature of the Dielectric Anomalies in ThioureaThe Journal of Chemical Physics, 1960