掺铌Pb(Zr,Sn,Ti)O_3反铁电-铁电转换电场的研究

Study on the Switching Field Induced Antiferroelectric to Ferroelectric Phase Transition in Nb Modified Pb(Zr,Sn,Ti)O_3

研究了掺铌PZST反铁电陶瓷中组份和温度对诱导反铁电 -铁电相变转换电场的影响 ,测定了Pb0 .99Nb0 .0 2 ((Zr0 .80Sn0 .2 0 ) 1-yTiy) 0 .98O3 系中正向转换电场EF 与组份 y(Ti)的关系和电极化前后的反铁电 /铁电相界。实验测量结果显示 ,某组份 y(Ti)的反铁电—铁电转换电场强度大小取决于该组份与铁电 /铁电相界组份的差距。在Pb0 .99Nb0 .0 2 ((Zr0 .80 Sn0 .2 0 ) 1-yTiy) 0 .98O3 系中随着试样温度升高 ,反向转换电场EB 保持不变 ,正向转换电场EF 和电滞ΔE降低。这一现象表明温度有助于降低反铁电 -铁电相变的应变能使得电场诱导反铁电 -铁电相变容易进行 ,因此可以采用加热电极化方法来降低极化电场强度。

This work studied the effect of composition and temperature on the switching electric field induced antiferroelectric to ferroelectric phase transition in Nb modified Pb(Zr,Sn,Ti)O3 antiferroelectric ceramics, measured the relation between switching field and composition y(Ti), both the antiferroelectric-ferroelectric phase boundaries before and after poling in Pb0.99Nb0.02((Zr0.80Sn0.20) 1-yTiy)0.98O3 family. Measurement results showed that the switching field strength of some y(Ti) was dependent on the change from that of antiferroelectric-ferroelectric phase boundary. The backward switching field EA was fixed while the forward switching field EF and hysteresis ΔE were dropped when increasing temperature. This phenomenon indicated that temperature increase is beneficial to the reduction of strain energy so as to make the antiferroelectric-ferroelectric phase transition easier. Hence we could make use of electric polarization by heating to lower the electric field.