Temperature study of the elastic properties of glycinium phosphite and deuterated glycinium phosphite crystals by brillouin scattering

Authors
Lapsa, K Drozdowski, M Ziobrowski, P Szczepanska, L
Citation
K. Lapsa et al., Temperature study of the elastic properties of glycinium phosphite and deuterated glycinium phosphite crystals by brillouin scattering, FERROELECTR, 239(1-4), 2000, pp. 957-962
Citations number
14
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
FERROELECTRICS
ISSN journal
00150193 → ACNP
Volume
239
Issue
1-4
Year of publication
2000
Pages
957 - 962
Database
ISI
SICI code
0015-0193(2000)239:1-4<957:TSOTEP>2.0.ZU;2-#
Abstract
Brillouin spectroscopy was used to study the elastic properties of glyciniu m phosphite (GPI) and deuterated glycinium phosphite (DGPI) crystals. The t emperature measurements of the hypersonic velocity for acoustic modes propa gating in various directions have been performed in the temperature range 1 70 K-300 K and 295 K-355 K for GPI and DGPI, respectively. Brillouin study has confirmed the existence of the order-disorder type ferroelectric phase transition (P2(1)/a - P2(1)) at 224 K for GPI and 322 K for DGPI. The obtai ned results are also discussed in terms of the reordering of the hydrogen b onds in the ferroelectric phase.