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Correlation between the grain size and phase structure, electrical properties in BiScO 3 ‐PbTiO 3 ‐based piezoelectric ceramics
Author(s) -
Dong Yazhu,
Zhou Zhiyong,
Liang Ruihong,
Dong Xianlin
Publication year - 2020
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.17174
Subject(s) - materials science , sintering , piezoelectricity , grain size , tetragonal crystal system , ceramic , dielectric , microstructure , ferroelectricity , phase (matter) , composite material , mineralogy , optoelectronics , chemistry , organic chemistry
As one of the most promising candidates of high‐temperature piezoelectric sensors, BiScO 3 ‐PbTiO 3 (BS‐PT)‐based ceramics are commonly modified by end‐member substitution to modify the phase structures and electrical properties. In this work, BS‐PT‐based piezoelectric ceramics with various grain sizes (1.4‐3.7 μm) of the composition 0.98(0.36BiScO 3 ‐0.64PbTiO 3 )‐0.02Bi(Sn 1/3 Nb 2/3 )O 3 were prepared by conventional solid‐state reaction method at different sintering temperatures from 1100℃ to 1180℃. X‐Ray diffraction results show that the tetragonal phase content increases from 68.9% to 85.7% with the increasing sintering temperature. Transmission electron microscope characterizations reveal that micromorphology and domain morphology are sensitive to grain size. In addition, the dielectric and ferroelectric properties are almost independent on the sintering temperature, whereas an optimal piezoelectric constant d 33 of 450 pC/N is achieved when the sintering temperature is 1120℃, which can be due to the suitable coexistence of the rhombohedral and tetrahedral phase, as well as the coexistence of nanodomains and subsize strip‐like domain. All of the results not only open a new window to improve d 33 of piezoelectric ceramics but also help to further understand microstructure‐property relationships in piezoelectric ceramics.