Premium
Dielectric Relaxor Evolution and Frequency‐Insensitive Giant Strains in ( Bi 0.5 Na 0.5 ) TiO 3 ‐Modified Bi ( Mg 0.5 Ti 0.5 ) O 3 – PbTiO 3 Ferroelectric Ceramics
Author(s) -
Zhao Wanli,
Zuo Ruzhong,
Zheng Donggeng,
Li Longtu
Publication year - 2014
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/jace.12841
Subject(s) - materials science , dielectric , ternary operation , polarization (electrochemistry) , electric field , analytical chemistry (journal) , chemistry , physics , optoelectronics , chromatography , computer science , programming language , quantum mechanics
The 0.45 Bi ( Mg 0.5 Ti 0.5 ) O 3 –(0.55 − x ) PbTiO 3 – x ( Bi 0.5 Na 0.5 ) TiO 3 ( BMT – PT – x BNT ) ternary solid solution ceramics were prepared via a conventional solid‐state reaction method; the evolution of dielectric relaxor behavior and the electrostrain features were investigated. The XRD and dielectric measurements showed that all studied compositions own a single pseudocubic perovskite structure and undergo a diffuse‐to‐relaxor phase transition owing to the evolution of the domain from a frozen state to a dynamic state. The formation of the above dielectric relaxor behavior was further confirmed by a couple of measurements such as polarization loops, polarization current density curves, as well as bipolar strain loops. A large strain value of ~0.41% at a driving field of 7 kV/mm (normalized strain d 33 * of ~590 pm/V) was obtained at room temperature for the composition with x = 0.32, which is located near the boundary between ergodic and nonergodic relaxor. Moreover, this electric field‐induced large strain was found to own a frequency‐insensitive characteristic.