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ｍａｘ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、ＢＦＥ－ＡＦＥ减小．实验中发现ＥＡＦＥ－ＦＥ和Ｅ分别与ＴＦＥ－ＡＦＥ和Ｔｃ相关，随着ＴＥＦ－ＡＦＥ的升高和Ｔｃ的降低，ＥＡＦＥ－ＦＥ和Ｅ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 max and transition temperature TFE-AFE increase, switching field EAFE-FE and EFE-AFE decrease. The forward switching field EAFE-FE and hysteresis E were observed to be dependent on TFE-APE and TC, respectively, and EAFE-FE and E decreased with an associated increasing in TFE-AFE and decreasing in Tc.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第5期807-814,共8页
Journal of Inorganic Materials
关键词
反铁电
电场诱导相变
PZST陶瓷
铁电相变
antiferroelectrics
electric field-induced phase transition
metastable state
ceramics
