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Giant electro‐strain in textured Li + ‐doped 0.852BNT–0.11BKT–0.038BT ternary lead‐free piezoelectric ceramics
Author(s) -
Si Yuan,
Li Ying,
Li Li,
Li Hao,
Zhao Zhihao,
Dai Yejing
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.16853
Subject(s) - piezoelectricity , materials science , ceramic , piezoelectric coefficient , ternary operation , composite material , hysteresis , grain size , texture (cosmology) , doping , strain (injury) , mineralogy , optoelectronics , condensed matter physics , chemistry , medicine , physics , image (mathematics) , artificial intelligence , computer science , programming language
Texturing is an effective approach to improving the piezoelectricity of piezoelectric ceramics. In this work, <001> textured Li + ‐doped 0.852Bi 0.5 Na 0.5 TiO 3 –0.11Bi 0.5 K 0.5 TiO 3 –0.038BaTiO 3 ternary lead‐free piezoelectric ceramics are prepared by the reactive templates grain growth (RTGG) method. X‐ray diffraction (XRD) results demonstrate a high orientation degree of 77% along the <001> direction. Outstanding electro‐strain response, which is higher than most of reported BNT‐based textured ceramics, is achieved due to the contribution of oriented‐grains along the <001> direction. A large electro‐strain of 0.55% with a relatively low hysteresis is obtained at 6.5 kV/mm with corresponding large signal piezoelectric coefficient ( d 33 ∗ ) of 846 pm/V in the textured ceramics, which is 49% higher than that of the random ceramics. Besides, the electro‐strain could reach as high as 0.52%@5.5 kV/mm ( d 33 ∗ = 945 pm/V) at 100°C. These results indicate that the RTGG is an effective way to design high performance lead‐free piezoelectric materials.