钛含量对温度梯度PZT铁电体电极化特性的影响

Effect of Ti Content on the Characteristic of Electric Polarization for Temperature-graded PZT Ferroelectric

根据Landau-Devonshire自由能理论,研究了当温度呈梯度变化时,不同钛含量的PZT铁电体的电极化特性。结果表明,当温度呈正(负)梯度变化时,极化强度沿轴向单调递减(增);极化强度变化程度随钛组分的增多而减小。计算了当温度变化量一定时,PZT50/50、40/60、20/80和PbTiO3铁电体的单位面积电荷偏移量,拟合结果显示,钛组分的增加,将导致电荷偏移量数值的逐渐减小。

Based on Landau-Devonshire free energy theory,the characteristic of electric polarization for temperaturegraded PbZr_（1-x）Ti_xO_（3）（PZT） ferroelectric with different Ti contents was investigated.The results show that for the positive/negative temperature-gradient,the polarization decreases/increases monotonically with increasing the axial distance.And the polarization variety decreases as Ti content increases.Moreover,the charge offset per unit area of PZT 50/50,40/60,20/80 and PbTiO_3 with the constant temperature-gradient were calculated,which indicates that the increase of Ti content induces the gradual decrease of the charge offset.