Diffuse phase transition and dielectric tunability of Ba(ZryTi1-y)O-3 relaxor ferroelectric ceramics
Document Type
Article
Publication Date
1-1-2004
Abstract
Barium zirconate titanate Ba(ZryTi1-y)O-3 (BZT, y = 0.2, 0.25, 0.30, 0.35) ceramics have been prepared by a sol-gel process. The temperature dependence of dielectric permittivity of the ceramics has been investigated. The results show that the phase transition temperature T-C (or T-m) is suppressed with increasing Zr content. The degree of diffuseness of the phase transition is more pronounced for higher Zr content, implying the existence of a composition-induced diffuse phase transition of the ceramics with 0.20 less than or equal to y less than or equal to 0.35. For BZT ceramics with y > 0.25, a relaxor ferroelectric characteristic is observed. High turtability and figure of merit are obtained in BZT compositions investigated, which imply that these ceramics are promising materials for tunable capacitor applications. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Keywords
Bzt ceramic, Diffuse phase transition, Relaxor behavior, Electric field, Tunability, Thin-films, Behavior, Viscosity, Defects
Divisions
PHYSICS
Publication Title
Acta Materialia
Volume
52
Issue
17
Additional Information
Department of Physics, Faculty of Science Building, University of Malaya, 50603 Kuala Lumpur, MALAYSIA