锰掺杂对PZNT相结构和机电性能的影响

Properties of Pb(Zn_(1/3)Nb_(2/3))_(0.20)(Zr_(0.52)Ti_(0.48))_(0.80)O_3 Ceramics Modified by MnO2

采用二步合成法制备了Pb(Zn1/3Nb2/3)0.20(Zr0.52Ti0.48)0.80O3+xMnO2压电陶瓷,探讨了不同剂量锰掺杂对陶瓷样品的相结构和机电性能的影响。结果表明,在1 200℃下烧结2 h,可得到处在准同型相界附近纯钙钛矿结构的压电陶瓷;随着MnO2掺杂量的增加,试样的压电常数d33和机电耦合系数kp先增大后减小,当掺杂w(MnO2)=0.2%时,d33和kp均达到最大值,分别为250 pC/N和0.52;而介电损耗tanδ持续下降,机械品质因数Qm则持续上升。当掺杂w(MnO2)=0.5%时,tanδ达到最小值,Qm达到最大值,其值分别为0.004 6和1 434。

Pb（Zn1/3 Nb2/3 ） 0. 20 （Zr0. 52 Ti0.48 ） 0.80O 3 ＋ xMnO2 piezoelectric ceramics were prepared using eolumbite precursor. The effects of crystallographic phase and,electromechanieal properties on the addition of MnO2 were investigated. The results showed that the pure perovskite structure nearly by the morphotropic phase boundary （MPB） was obtained at sintering of 1 200 ℃ for 2 h. With the increasing of MnO2 content, the piezoelectric constant d33 and electromechanical coupling factor kp increase, then decrease. When the mass content of MnO2 is 0.2%, the largest d33 and kp were obtained, they are 250 pC/N and 0. 52, respectively. Moreover, the dielectric loss tand decreases and the mechanical quality factor Qm increases with the increasing of MnO2. When the mass content of MnO2 is 0.5 %, the smallest tand and the largest Qm was Obtained, they are 0. 004 6 and 1 434, respectively.