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Composition‐induced phase transitions and enhanced electrical properties in bismuth sodium titanate ceramics
Author(s) -
Yin Jie,
Zhao Chunlin,
Zhang Yuxing,
Wu Jiagang
Publication year - 2017
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.15083
Subject(s) - phase boundary , materials science , bismuth titanate , tetragonal crystal system , bismuth , phase transition , ceramic , piezoelectricity , crystallite , ferroelectricity , electric field , polarization (electrochemistry) , phase (matter) , analytical chemistry (journal) , mineralogy , condensed matter physics , composite material , dielectric , chemistry , metallurgy , optoelectronics , physics , quantum mechanics , chromatography , organic chemistry
Here, the composition‐induced phase transition and enhanced electrical properties were investigated in terms of lead‐free {[Bi 0.5 (Na 0.82− x K 0.18 Li x ) 0.5 ] 1− y Sr y }TiO 3 ( BNKLST ‐ x / y, x =0‐0.175 and y =0‐0.125) ceramics. The rhombohedral and tetragonal phase boundary can be constructed, and then the enhancement of piezoelectric properties ( d 33 ~271 pC/N and k p ~0.38) can be observed for x =0.10 and y =0.05, which is superior to most reported results in polycrystalline BNT ‐based ceramics. In particular, a fatigue‐free behavior after 10 6 polarization switching cycles was shown in the BNKLST ‐0.10/0.05 ceramics due to the reversible field‐induced phase transition, and a slight decrease in d 33 (~4.5%) was also shown. More importantly, the general model of electric field, temperature, and composition‐induced phase transition was employed to explain the enhancement of piezoelectric and fatigue properties. We believe that the composition design of this system can promote the development of bismuth sodium titanate lead‐free ceramics.