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Enhanced piezoelectricity and temperature stability in LaFeO 3 ‐modified KNN‐based lead‐free ceramics
Author(s) -
Wang Ting,
Wu Chao,
Xing Jie,
Wu Jiagang,
LiChen Bowen,
Xu Xingyu,
Wang Ke,
Zhu Jianguo
Publication year - 2019
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.16493
Subject(s) - materials science , piezoelectricity , phase boundary , curie temperature , ceramic , sintering , atmospheric temperature range , phase transition , phase (matter) , analytical chemistry (journal) , ferroelectricity , mineralogy , composite material , thermodynamics , dielectric , condensed matter physics , chemistry , chromatography , optoelectronics , physics , organic chemistry , ferromagnetism
(0.96‐ x )K 0.48 Na 0.52 NbO 3 ‐0.04Bi 0.5 Na 0.5 ZrO 3 ‐ x LaFeO 3 ceramics (abbreviated as KNN‐BNZ‐LF1000 x ) with enhanced piezoelectric performance and temperature stability were prepared by the conventional solid‐state sintering method. It was found that the incorporation of LaFeO 3 gradually shifted the O‐T phase boundary toward room temperature, while maintaining the Curie temperature above 300°C. The optimal piezoelectricity was found at x = 0.006, with relatively high piezoelectric constant d 33 of 345 pC/N as well as a high level of unipolar strain (0.126% at 3 kV/mm). Benefiting from the diffused phase transition induced by appropriate amount of LaFeO 3 content, the KNN‐BNZ‐LF6 sample possessed greatly enhanced the temperature stability of d 33 ∗ , which varied less than 8% in the temperature range of 20°C‐100°C.