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Relaxor Behavior and Dielectric Properties of MgTiO 3 ‐Doped BaZr 0.35 Ti 0.65 O 3 Composite Ceramics for Tunable Applications
Author(s) -
Chou Xiujian,
Zhai Jiwei,
Yao Xi
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01825.x
Subject(s) - dielectric , materials science , composite number , ceramic , doping , dielectric loss , ferroelectricity , ferroelectric ceramics , phase (matter) , microwave , high κ dielectric , composite material , mineralogy , optoelectronics , telecommunications , chemistry , organic chemistry , computer science
MgTiO 3 ‐doped BaZr 0.35 Ti 0.65 O 3 (BZT) composite ceramics have been prepared by the conventional solid‐state route. The dielectric nonlinear characteristics and relaxor behavior of these composite ceramics have been investigated. The secondary‐phase BaMg 6 Ti 6 O 19 is formed among BZT composite ceramics with the increase of MgTiO 3 . BZT composite ceramics show typical diffuse phase transition characteristic and ferroelectric relaxor behavior. The dielectric constant of BZT composite ceramics can be tailored from thousands to hundreds by manipulating the addition of MgTiO 3 . The dielectric loss still keeps around 0.001 and the tunability is above 20% at a dc‐applied electric field of 25 kV/cm. Suitable dielectric constant, low dielectric loss, and high tunability of this kind of composite ceramics can be useful for potential microwave tunable applications.