RELAXOR FERROELECTRICS IN THE RANDOM-FIELD THEORY FRAMEWORK

Citation
Md. Glinchuk et al., RELAXOR FERROELECTRICS IN THE RANDOM-FIELD THEORY FRAMEWORK, Ferroelectrics, 199(1-4), 1997, pp. 11-24
Citations number
23
Categorie Soggetti
Physics, Condensed Matter","Material Science
Journal title
ISSN journal
00150193
Volume
199
Issue
1-4
Year of publication
1997
Pages
11 - 24
Database
ISI
SICI code
0015-0193(1997)199:1-4<11:RFITRT>2.0.ZU;2-F
Abstract
A model for quantitative description of the relaxer ferroelectrics pro perties in the random field theory framework is proposed. An order par ameter, phase transition temperature, critical concentration of random field sources were calculated with the help of the fields distributio n function allowing for nonlinear and spatial correlation effects. Ess ential differences were obtained in comparison with linear approach, n amely the phase transition order change, appearance of maximum in tran sition temperature T-c concentrational dependence. The comparison betw een calculated and experimental data has been made for the model ferro electric relaxer PLZT x/65/35. Fairly good agreement between calculate d and measured T-c(x) and critical concentration of lanthanum have bee n obtained.