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Electrical Properties and Relaxor Phase Evolution of Li‐Modified BNT ‐ BKT ‐ BT Lead‐Free Ceramics
Author(s) -
Yin DongSheng,
Zhao ZhiHao,
Dai YeJing,
Zhao Zhe,
Zhang XiaoWen,
Wang SiHui
Publication year - 2016
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.14247
Subject(s) - materials science , ferroelectricity , phase transition , ceramic , analytical chemistry (journal) , permittivity , electric field , piezoelectricity , dielectric , sintering , dopant , strain (injury) , mineralogy , doping , composite material , condensed matter physics , chemistry , physics , optoelectronics , quantum mechanics , medicine , chromatography
By conventional ceramics sintering technique, the lead‐free 0.85Bi 0.5 Na 0.5(1− x ) Li 0.5 x TiO 3 ‐0.11Bi 0.5 K 0.5 TiO 3 ‐0.04BaTiO 3 ( x =0–0.15) piezoelectric ceramics were obtained and the effects of Li dopant on the piezoelectric, dielectric, and ferroelectric properties were studied. With increasing Li addition, the temperature‐dependent permittivity exhibited the normal ferroelectric‐to‐ergodic relaxor ( FE ‐to‐ ER ) transition temperature ( T FE ‐ ER , abbreviated as T F‐R ) decreasing down to room temperature. The increasing Li content also enhanced the diffuseness of the FE ‐to‐ ER transition behavior. For composition with x = 0.15, a large unipolar strain of 0.37% ( d 33∗= S max / E max = 570 pm/V) was achieved under 6.5 kV/mm applied electric field at room temperature. Both unipolar and bipolar strain curves related to the temperature closely, and when the temperature reached the T F‐R , the normalized straind 33∗achieved a maximum value (e.g., for x = 0.10,d 33∗= 755 pm/V) owing to the electric‐field‐induced ER ‐to‐ FE state transition.