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无机材料学报

无机材料学报

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组份变化对PZST陶瓷反铁电-铁电相变的影响

杨同青; 姚熹; 张良莹   

  1. 同济大学功能材料研究所, 上海 200092
  • 收稿日期:1999-11-05 修回日期:1999-12-10 出版日期:2000-10-20 网络出版日期:2000-10-20

Effects of Compositional Variations on Antiferroelectric-Ferroelectric Phase Transition of PZST Ceramics

YANG Tong-Qing; YAO Xi; ZHANG Liang-Ying   

  1. Functional Materials Research Laboratory; Tongji University; Shanghai 200092; China
  • Received:1999-11-05 Revised:1999-12-10 Published:2000-10-20 Online:2000-10-20

PDF (PC)

907

被引次数

9

摘要： 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．

关键词: 反铁电, 电场诱导相变, 亚稳态, 陶瓷

Abstract: 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．

Key words: antiferroelectrics, electric field-induced phase transition, metastable state, ceramics

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