铌锌酸铅基铁电陶瓷的介电弥散行为

DIELECTRIC DISPERSION IN PZN BASED FERROELECTRIC CERAMICS

通过对（０．９－ｘ）Ｐｂ（Ｚｎ１／３Ｎｂ２／３）Ｏ３－０．１ＢａＴｉＯ３－ｘＰｂＴｉＯ３（ｘ＝０．００，０．０５，０．１０，０．１５）系列铁电陶瓷射频（２０Ｈｚ—１ＧＨｚ）复介电常数ε（ε＝ε′＋ｉε″）的测试，观察到其介电弥散行为在１０ＭＨｚ以下随ＰｂＴｉＯ３含量的增加而减弱；在１０ＭＨｚ以上却都表现出强烈的介电弥散，伴有强烈的介电损耗峰，并且介电损耗峰随ＰｂＴｉＯ３含量的增加而向高频移动．结合其介电温度谱与电滞回线的测量结果，探讨了这一系列铁电陶瓷材料介电弥散行为与铁电微畴的关系．

The frequency dependence of complex dielectric response ε  ( ε  = ε′ + iε ″ ) of (0.9- x )Pb(Zn 1/3 Nb 2/3 )O 3-0.1BaTiO 3- x PbTiO 3( x =0.00,0.05,0.10,0.15) ferroelectric ceramics was measured carefully between 20Hz and 1GHz. It was observed that the dielectric dispersion became weaker with the increase of PbTiO 3 content below 10MHz. There is a strong dielectric dispersion with a high absorption peak, above 10MHz, which shifts towards higher frequency with the increase of PbTiO 3 content. Comparing with the temperature dependence of the dielectric behavior, the hystersis and the reversal polarization current, the different contributions to dielectric dispersion of microdomains and macrodomains are discussed.