Freezing of dipole dynamics in relaxor ferroelectric Pb(Mg1/3Nb2/3)O-3-PbTiO3 as evidenced by dielectric spectroscopy

Authors
Bokov, AA Ye, ZG
Citation
Aa. Bokov et Zg. Ye, Freezing of dipole dynamics in relaxor ferroelectric Pb(Mg1/3Nb2/3)O-3-PbTiO3 as evidenced by dielectric spectroscopy, J PHYS-COND, 12(34), 2000, pp. L541-L548
Citations number
16
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF PHYSICS-CONDENSED MATTER
ISSN journal
09538984 → ACNP
Volume
12
Issue
34
Year of publication
2000
Pages
L541 - L548
Database
ISI
SICI code
0953-8984(20000828)12:34<L541:FODDIR>2.0.ZU;2-E
Abstract
Complex dielectric susceptibility (chi'+j chi ") has been studied at f = 10 (-2)-10(-5) Hz in the relaxer ferroelectric 0.75Pb(Mg1/3Nb2/3)O-3-0.25PbTiO (3). In addition to the well known relaxer dispersion observed at temperatu res around and below the temperature of permittivity maximum T-m, a new and comparatively weak dispersion has been disclosed at T > T-m. It is describ ed by the 'universal relaxation law', chi " = cot(n pi/2)chi' alpha f(n-1). The temperature dependence of the exponent n follows the Vogel-Fulcher rel ation, indicating a process of freezing into the nonergodic state.