Brillouin and Raman study of the ferroelectric phase transition in PbHPO4
- 1 January 1978
- journal article
- research article
- Published by Taylor & Francis in Ferroelectrics
- Vol. 21 (1) , 325-327
- https://doi.org/10.1080/00150197808237254
Abstract
In order to investigate the dynamics of members of a novel series of ferroelectrics we have measured the Raman spectra of PbHPO4, as well as the Brillouin spectra in the paraelectric and ferroelectric phases. Mode assignment has been made. A weak underdamped soft mode has been observed below 100 cm-1. The Brillouin spectra revealed low frequency dispersion below Tc which could be fitted very well to the simple relaxation type formula. By comparison with far infrared reflectivity data we conclude that a low frequency relaxing mode and not the mode which is observed in Raman is responsible for the transition.Keywords
This publication has 4 references indexed in Scilit:
- The growth of PbHPO4 and Pb4 (NO3)2(PO4)2 · 2H2O in gelsJournal of Crystal Growth, 1976
- Vibrational Spectra, Hydrogen Bonding, and Ferroelectricity in the PbHPO4 FamilyPhysica Status Solidi (b), 1976
- Ferroelectricity in lead monohydrogen phosphate, PbHPO4, and the deuterated form, PbDPO4Ferroelectrics, 1973
- Brillouin-Scattering Dispersion in Ferroelectric Triglycine SulfatePhysical Review Letters, 1966