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采用添加造孔剂的方法制备多孔锆钛酸铅(PZT)陶瓷,并研究了孔隙率和晶粒尺寸对多孔PZT陶瓷介电和压电性能的影响及机理.研究表明:孔隙率的增加降低了多孔PZT陶瓷的介电常数,提高了静水压优值,并证明在一定条件下孔隙率与介电常数关系可由Okazaki经验公式及Banno模型预测;晶粒尺寸增加,多孔PZT陶瓷的介电常数、压电系数和优值增加,并可用Okazaki空间电荷理论解释晶粒尺寸对试样介电和压电性能的影响.对于添加重量百分数为10%造孔剂的多孔PZT陶瓷,当烧结温度为1300℃时,孔隙率为34%,d33达312pC/N接近致密PZT(350pC/N),其静水压优值为致密PZT的十几倍;介电常数和压电系数比具有相当优值的PZT聚合物复合材料高很多,在具有高灵敏度的同时能更有效地抗外界干扰.
Porous porous lead zirconate (PZT) ceramics were prepared by adding pore-forming agent, and the effects of porosity and grain size on the dielectric and piezoelectric properties of porous PZT ceramics were investigated. The results show that the porosity increases The dielectric constant of porous PZT ceramics increased the optimal value of hydrostatic pressure and proved that the relationship between porosity and dielectric constant under certain conditions can be predicted by Okazaki empirical formula and Banno model. The grain size increases and the dielectric of porous PZT ceramics Constant, piezoelectric coefficient and figure of merit increase, and Okazaki space charge theory can be used to explain the effect of grain size on the dielectric and piezoelectric properties of the samples.For the porous PZT ceramics with addition of 10% Is 1300 ℃, porosity is 34%, d33 reaches 312pC / N close to dense PZT (350pC / N), and its hydrostatic pressure is ten times of that of dense PZT. The dielectric constant and piezoelectric coefficient ratio are quite good The value of the PZT polymer composite is much higher, with high sensitivity and more effective against external interference.