对ＦＥ－ＡＦＥ相界附近ＰＺＳＴ陶瓷结构、性能及场诱相变临界参数随组份和温度的变化进行了研究，在相变临界温度ＴＦＥ－ＡＦＥ以下，被电场诱导出的铁电态在撤去电场后以亚稳态形式存在；随着温度升高，亚稳铁电态在此温度转变为反铁电态．随着Ｔｉ含量的增加，样品由四方反铁电相穿越相界转变为三方铁电相，介电常数峰值εｍａｘ增大；同时亚稳铁电态→反铁电态相变温度ＴＦＥ－ＡＦＥ上升，电场诱导的 ＡＦＥ→ＦＥ相变临界参数 ＥＡＦＥ－ＦＥ、EＦＥ－ＡＦＥ减小．实验中发现ＥＡＦＥ－ＦＥ和ΔＥ分别与ＴＦＥ－ＡＦＥ和Ｔｃ相关，随着ＴＥＦ－ＡＦＥ的升高和Ｔｃ的降低，ＥＡＦＥ－ＦＥ和ΔＥ相应减小．
Phase structures，properties and critical parameters of field-induced phase transitions of PZST ceramics
near ferroelectric(FE)-antiferroelectric(AFE) phase boundary were studied as a function of composition and temperature．The electric field-induced FE
state can maintain metastable state below the critical temperature TFE-AFE after electric field is removed．As temperature increases，
the metastable FE state changes to AFE state at TFE-AFE．As Ti content increases，the structure of unpoled PZST ceramics changes from
tetragonal AFE phase to rhombohedral FE phase，dielectric constant maximum εmax and transition temperature TFE-AFE increase，
switching field EAFE-FE and EFE-AFE decrease．The forward switching field EAFE-FE and hysteresis Δ E were observed to
be dependent on TFE-AFE and Tc，respectively，and EAFE-FE and Δ E decreased with an associated increasing in TFE-AFE and decreasing in Tc．
参考文献
| [1] | Berlincourt D, Krueger H H A, Jaffe B． J. Phys. Chem. Solids?， 1964, 25: 659--674. [2] Haertling G H． Am. Ceram. Soc. Bull.， 1994, 73 (1): 93--96. [3] Cheng Z M, Lian J Y, Wang Y L． Ferroelectric， 1990, 101: 225--234. [4] Markowski K, Park S-E, Yoshikawa S, et al．J. Am. Ceram. Soc.?， 1996, 79 (12): 3297--3304. [5] Park S-E, Markowski K, Yoshikawa S, et al．J. Am. Ceram. Soc.?， 1997, 80 (2): 407--412. [6] Berlincourt D． IEEE Transactions on Sonics and Ultrasonics?， 1966, su-13 (4): 116--125. [7] 田中哲郎(日)等编, 陈俊彦 等译．压电陶瓷材料．北京：科学出版?社, 1982. 44--53. [8] 杨同青．Pb(Zr,Sn,Ti)O_3反铁电陶瓷场诱相变性能研究．博士学位论文．西?安交通大学, 1999. [9] 刘鹏．博士学位论文．西安交通大学, 1999. [10] Yang T Q, Liu P, Xu Z, et al. Ferroelectric， 1999, 230: 181--186. |
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