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孔隙率及晶粒尺寸对多孔PZT陶瓷介电和压电性能的影响及机理研究

曾 涛 董显林 毛朝梁 梁瑞虹 杨 洪

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孔隙率及晶粒尺寸对多孔PZT陶瓷介电和压电性能的影响及机理研究

曾 涛, 董显林, 毛朝梁, 梁瑞虹, 杨 洪

Effects of porosity and grain sizes on the dielectric and piezoelectric properties of porous PZT ceramics and their mechanism

Zeng Tao, Dong Xian-Lin, Mao Chao-Liang, Liang Rui-Hong, Yang Hong
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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%,d
    Porous lead zirconate titanate (PZT) ceramics were prepared by adding pore formers, and the effects of pore structure and grain sizes on the dielectric and piezoelectric properties of samples were investigated. The research showed that an increase in the porosity led to reduced dielectric constant as well as enhanced hydrostatic figures of merit (dh·gh). The effect of porosity on dielectric constant can be predicted by the Okazaki experiential formula and Banno model under certain conditions. An increase in grain size increases the dielectric constant, piezoelectric coefficient and hydrostatic figures of merit, which can be explained by the Okazaki space-charge theory. For the sample with 10 wt% PMMA additions sintered at 1300℃, the porosity is 34% and the longitudinal piezoelectric coefficient (d33) is very close to that of dense PZT ceramics, while the hydrostatic figures of merit (dh·gh) is about fifteen times greater than that of dense PZT ceramics. Compared with PZT-polymer composites, the dielectric constant and piezoelectric coefficient of 34% porous PZT sintered at 1300℃ is much higher and can be more efficient in resisting the interference from the ambient medium.
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出版历程
  • 收稿日期:  2005-11-25
  • 修回日期:  2005-12-14
  • 刊出日期:  2006-03-05

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