Hypersonic frequency softening and relaxation in relaxor ferroelectric 0.8Pb(Zn1/3Nb2/3)O-3-0.2PbTiO(3)

Authors
Kuok, MH Ng, SC Fan, HJ Iwata, M Ishibashi, Y
Citation
Mh. Kuok et al., Hypersonic frequency softening and relaxation in relaxor ferroelectric 0.8Pb(Zn1/3Nb2/3)O-3-0.2PbTiO(3), SOL ST COMM, 118(4), 2001, pp. 169-172
Citations number
19
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
SOLID STATE COMMUNICATIONS
ISSN journal
00381098 → ACNP
Volume
118
Issue
4
Year of publication
2001
Pages
169 - 172
Database
ISI
SICI code
0038-1098(2001)118:4<169:HFSARI>2.0.ZU;2-N
Abstract
Brillouin scattering from relaxer ferroelectric 0.8Pb(Zn1/3Nb2/3)O-3-0.2PbT iO(3) has been measured in the 300-723 K temperature range. A sharp ferroel ectric phase transition from cubic to tetragonal symmetry, associated with a phonon frequency dip and a Landau-Khalatnikov-like damping maximum, has b een observed near 528 K. Evidence for a relaxation mode in the form of a br oad Rayleigh wing, whose frequency is strongly temperature dependent above 528 K, is found. The relaxation time and frequency are evaluated based on t he tunneling model and a modified-superparaelectric model, respectively. (C ) 2001 Elsevier Science Ltd. All rights reserved.