【摘要】 本文研究了热压烧结和普通烧结的锆钛酸铅掺镧(PLZT)陶瓷的电致伸缩效应。用电阻应变计和改进的Sawyer—Tower电路同时测量了强电场下的电诱应变和极化强度。对x/70/30的多种组份研究表明:所有这些组份的基态是宏观非极化的,电致伸缩效应支配了电诱应变。组份为(7.6～8.0)/70/30的热压烧结PLZT陶瓷呈现出双电滞回线及电诱超弹现象。并且发现了电致伸缩系数随温度的增加在出现ON/OFF型弹滞回线的温区内急剧增大的新现象。更多还原

【Abstract】 The electrostriction in the Lanthanum-doped Lead Zirconate-Titanate(PLZT)ceramics with hot pressed and non-hot pressed sintering is investigated. Elec-tric polarizations and elastic strains are measured simultaneously for hot pres-sed (7, 7. 5, 8) /70 /30 and non-hot prested (7, 7. 5, 8) /70 /30 compositions. Theresults show that the ground state for all compositions is macroscopically non-polar, and the strains are dominantly electrostrictive in nature, It is foundthat the double hysteresis loops and the superelastic phenomenon induced by elec-tric field are revealed in (7. 6～8) /70 /30 compositions with hot pressed sin-tering. From the view point of microdomain, the microdomain-strain couplingmodel is suggested. This model gives more reasonable interpretation for super-elastic phenomenon. The dependence of electrostriction on temperature is exa-mined. it is found that in the temperature region where the ON/ OFF elastichysteresis loop is revealed, the electrostrictive coefficient is increased rapidlywith temperature increasing. This can be considered as now phenpmenon.更多还原