铌锌酸铅基陶瓷的铁电行为研究

Investigation of Ferroelectric Properties in PZN Based Ceramics

采用具有改进ＳａｗｙｅｒＴｏｗｅｒ电路的全自动铁电体电滞回线测试系统，对（０．９ｘ）Ｐｂ（Ｚｎ１／２Ｎｂ２／３Ｏ３０．１ＢａＴｉＯ３ｘＰｂＴｉＯ３［（ｘ＝０．０５，０．１０，０．１５，简称ＰＺＮＢＴＰＴ（０．１／ｘ）］系列铁电陶瓷样品在０℃～１９０℃温度范围内强场下的极化强度进行了详细测试，并与其弱场介电行为对比，探讨了铁电宏畴微畴不同的强场极化特性，发现ＰＺＮＢＴＰＴ（１０／１５）铁电陶瓷样品的极化强度在自发正常铁电体弛豫型铁电体转变温度Ｔｎｒ下有一个增大过程。

Hysteresis loops of (0.9x)Pb(Zn_1/2Nb_2/3O_30.1BaTiO_3xPbTiO_3 [(x=0.05,0.10 and 0.15, designated as PZNBTPT(0.1/x)] ferroelectric ceramics have been carefully measured as a function of applied field in the temperature range between 0℃ and 190℃. Comparing with the dielectric response, the different microscopic characteristics of polarization of microdomains and macrodomains in ferroelectric ceramics are discussed. To be noted that the polarization and remanent polarization of PZNBTPT(10/15) become larger below normalrelaxor ferroelectric phase transition temperature Tnr and its absence in PZNBTPT(10/15). This type of anomaly has previously not been reported in other relaxor ferroelectric system.