PBSZT压电陶瓷机械损耗和介电损耗的研究

Study on Mechanical and Dielectric Losses of the PBSZT Piezoelectric Ceramics

为探索Pb0.9Ba0.05Sr0.05(Sn1/3Nb2/3)0.06(Zn1/3Nb2/3)0.06Ti0.44Zr0.44O3+0.5%Sb2O3+0.5%Mn(NO3)2(质量分数)铅基压电陶瓷材料的损耗机理,进行成型工艺、烧结工艺的实验研究,实验制备的凝胶注模成型样品得到较低的介电损耗tanδ为0.25%,而干压成型得到更大的品质因数Qm为2 065。从微观结构角度来看,机械损耗主要依赖陶瓷微观结构的致密性,而tanδ较多的依赖于陶瓷结构的均匀性。

For investigating the loss mechanism of the lead-base piezoelectric ceramic materials,Pb0.9Ba0.05Sr0.05（Sn1/3Nb2/3）0.06（Zn1/3Nb2/3）0.06Ti0.44Zr0.44O3＋0.5%Sb2O3＋0.5%Mn（NO3）2 was studied by changing its forming technique and sintering technique. The specimen fabricated by gelcasting had low dielectric loss （tan δ= 0.25% ）, while the die pressing one had higher planar electromechanical coupling factor （Qm = 2 065）. The experiment results showed that the mechanical loss depended on the compactability and the dielectric loss mainly depends on the uni- formity of microstructure if the only influence factor of the microstructure on the losses was considered.