期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 41, 期 7, 页码 4116-4128出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2021.02.003
关键词
Lead-free piezoceramics; BNT-BT; Hardening characteristics; A-site and B-site acceptor doping
资金
- Thailand Research Fund (TRF) [TRG6080018]
- Synchrotron Light Research Institute (SLRI)
The study found that A-site Li doping is more effective in stabilizing the non-ergodic relaxor phase in BNT-BT ceramics compared to B-site Fe doping, while also improving the piezoelectric properties.
The effects of A-site Li- or B-site Fe-doping into 0.93(Bi0.5Na0.5)TiO3-0.07BaTiO3 (BNBT) ceramics were systematically investigated for the compositional ranges of (Bi0.465Na0.465Ba0.07)1-xLixTiO3 (BNBT-xLi) and (Bi0.465Na0.465Ba0.07)FexTi1-xO3 (BNBT-xFe) (x = 0.01?0.03). The R3c/P4bm phase ratio remained essentially unchanged across the entire set of Li and Fe doping levels studied. Although some typical characteristics for acceptor doping were observed for both BNBT-xLi and BNBT-xFe, their ferroelectric and piezoelectric properties were different. A clear transition from a slim (BNBT, Ec = 17.0 kV/cm, Pr = 22.9 ?C/cm2) to square-like P-E hysteresis loops (Ec = 29.9 kV/cm, Pr = 33.9 ?C/cm2) was observed in BNBT-xLi at x?0.02. In contrast, constricted P-E loops (Ec = 13.0?15.7 kV/cm and Pr = 28.6?31.7 ?C/cm2) and deformed butterfly S-E curves were detected in all BNBT-xFe ceramics. These results suggest A-site Li doping as a more effective method for stabilizing the non-ergodic relaxor phase in BNT-BT ceramics, which could help further tailor the piezoelectric properties in other A-site doped Bi-based perovskite systems.
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