PMS-PZN-PZT四元系压电陶瓷的性能研究
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摘要
本文采用传统的固相烧结方法制备了Pb(Mn_(1/3)Sb_(2/3))O_3-Pb(Zn_(1/3)Nb_(2/3))O_3- PbZrO_3-PbTiO_3(PMS-PZN-PZT)四元系压电陶瓷,并通过添加MnO_2、Ni_2O_3、以提高材料的性能。通过X射线衍射(XRD)对合成后材料的晶相进行了分析,用扫描电子显微镜(SEM)观察了样品表面的显微结构,并且讨论了组成和烧结温度对材料介电、压电性能以及温度稳定性的影响。通过研究Zr/Ti比对PMS-PZN-PZT系统性能的影响发现:三方相和四方相共存的准同型相界位于一个很宽的组成范围内;在850℃的煅烧温度、1245℃的烧结温度且保温2h的条件下,当Zr/Ti=50/50时,得到综合性能优良的压电材料:相对介电常数ε33T/ε0=1243,介电损耗tanδ=0.004,压电常数d_(33)=296pC/N,机电耦合系数Kp =0.532,机械品质因数Qm=1605,居里温度Tc=297℃;随着Zr/Ti比的增大,谐振频率的温度系数由正变为负,在Zr/Ti=50/50时获得最小值,反映了四方相向三方相的转变。
     此外,研究了Mn含量和烧结温度对Mn、Ni掺杂PMS-PZN-PZT四元系统介电、压电性能的影响。Mn掺杂使得组成从准同型相界向三方相移动,极大地降低了居里温度且增大了系统的弥散程度。在850℃的煅烧温度、1220℃的烧结温度且保温2h的条件下,当Mn=0.1wt%,Zr/Ti=50/50时,系统的综合性能最佳:ε_(33)T/ε_0=1244,tanδ=0.004,d_(33)=277pC/N,K_p=0.62,Q_m=2415, Tc=280℃。
Pb(Mn_(1/3)Sb_(2/3))O_3-Pb(Zn_(1/3)Nb_(2/3))O_3-PbZrO_3-PbTiO_3 (PMS-PZN-PZT) quaternary piezoelectric ceramics were prepared by conventional solid solution method. The samples were gained by adding MnO_2, Ni_2O_3 in order to enhance the properties. The X-ray diffraction (XRD) and the scanning electronic microscope (SEM) were applied to analyze phases and microstructure, respectively. The effects of the composition and the sintering temperature on the dielectric and piezoelectric properties and temperature stability of the system were also discussed. The study on the properties of the system indicated that the MPB of the tetragonal and rhombohedral phase lay in a broad composition region. The optimum properties were obtained with Zr/Ti=50/50 at calcination temperature of 850℃and sintering temperature of 1245℃. The main parameters:ε_(33)T/ε_0=1243, tanδ=0.004, d_(33)=296pC/N, K_p =0.532, Q_m=1605, T_c=297℃. The temperature coefficient of resonant frequency shifted from plus (+) into minus (-) value with increasing Zr/Ti ratio and obtained a minimum value at Zr/Ti=50/50, which reflected the transition from tetragonal phase to rhombohedral phase.
     In addition, PMS-PZN-PZT quaternary system doped by Mn, Ni close to the the morphotropic phase boundary (MPB) were investigated systematically as a function of Mn doping and sintering temperature. Doping of Mn shifted compositions away from the MPB toward the rhombohedral phase, greatly reduing the Curie temperature and broadening the dielectric constant maximum. When calcination temperature is 850℃and sintering temperature is 1220℃, the optimum properties ofε_(33)T/ε_0 (1244), tanδ(0.004), d_(33) (277pC/N), K_p(0.62), Q_m(2415), T_c(280℃) were obtained with Mn=0.1wt% and Zr/Ti=50/50.
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