0-3型(PZT，KTN)／P(VDF-TrFE)三相铁电复合材料的电学性能

Electric properties of 0-3(PZT,KTN)/P(VDF-TrFE) triphasic ferroelectric composites

以偏氟乙烯-三氟乙烯(P(VDF-TrFE))共聚物为基体,锆钛酸铅(PZT)铁电颗粒为功能相,钽铌酸钾(KTN)颗粒为增强相,制备了0-3型(PZT,KTN)/P(VDF-TrFE)三相铁电复合材料。利用SEM及EDAX技术,分析了复合材料的显微结构及PZT和KTN相的分布。测试了具有不同KTN体积分数的复合材料的电性能。实验结果表明:PZT和KTN相的颗粒分布均匀,存在少量的团聚体;随KTN体积分数的增加,三相复合材料的极化漏电流I、介电常数rε和介电损耗tanδ增加,压电系数d33降低,而热释电系数p3先增加后降低,但其d33和p3均高于具有相同PZT体积分数的PZT/P(VDF-TrFE)两相复合材料。

0-3 （PZT, KTN）/ P （VDF-TrFE）triphase ferroelectric composite was prepared when potassium tantalate niobate （KTN） particles and lead zirconate titanate （PZT） particles were embedded into the polyvinylidene fluoride trifluoroethylene （P（VDF-TrFE）） copolymer. The microstructure and distributions of PZT phase and KTN phase were analyzed using SEM and EDAX technique. The electric properties were measured for the ferroelectric composite with different volume fractions of KTN phase. The results indicate that PZT and KTN particles are distributed uniformly although a few of clusters occur. With increasing the KTN volume fraction, the poling current I, dielectric constant e, and dielectric loss tan δ increase, piezoelectric coefficients d33 and pyroelectric coefficients P3 increase firstly and then reduce, hut both d33 and P3 are higher than those of PZT/P（VDF-TrFE） composite with the same PZT volume fraction.