Raman and dielectric measurements on ferrielectric ammonium sulphate
- 1 January 1976
- journal article
- research article
- Published by Taylor & Francis in Ferroelectrics
- Vol. 12 (1), 181-183
- https://doi.org/10.1080/00150197608241420
Abstract
Polarized Raman spectra reveal temperature dependent central peaks above Tc due to librational modes of ammonium groups. The corresponding order parameter of Ag symmetry explains the elastic anomaly of the paraelectric phase. The ferrielectric structure of the ordered phase has been tested by doping (NH4)2SO4 with Rb2SO4. The results support the order-disorder model for this phase transition.Keywords
This publication has 5 references indexed in Scilit:
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- The Origin of the Ferroelectric Phase Transition in Ammonium SulfateJournal of the Physics Society Japan, 1973
- Far infrared properties of the pseudoproper ferroelectric ammonium sulfateFerroelectrics, 1973
- Raman and infrared studies of the ferroelectric transition in ammonium sulphateJournal of Physics and Chemistry of Solids, 1972