高居里温度压电材料的制备及其性能研究_材料科学与工程.rar

摘要：高居里温度压电材料在较高温度下仍能良好工作，使其能应用于航天航空、核能、冶金、石油化工等许多领域。通过传统的固相反应、利用钨锰铁矿预合成法，在不同的烧结温度制备了xPb(Yb1/2Nb1/2)O3-(1-x)Pb(Zr0.35Ti0.65)O3（xPYN-(1-x)PZT）陶瓷。X射线衍射分析表明，合成的xPYN-(1-x)PZT（x=0.025-0.15）陶瓷为较纯的四方钙钛矿结构。在相同的烧结工艺条件下，0.075PYN-0.925PZT陶瓷具有最大的致密度，达到理论密度的92.24%。xPYN-(1-x)PZT陶瓷的介电响应峰比较尖锐，随着Pb(Yb1/2Nb1/2)O3（PYN）含量的增加，居里温度呈上升趋势。xPYN-(1-x)PZT陶瓷呈现典型的P-E电滞回线。0.125PYN-0.875PZT陶瓷的铁电性能较好，剩余极化、矫顽场分别为20.40C/cm2、37.75kV/cm。xPYN-(1-x)PZT陶瓷的压电应变常量d33较小，0.125PYN-0.874PZT陶瓷的压电性能最好，也仅达到68pC/N。xPYN-(1-x)PZT陶瓷的Qm、Kp、Kt值随着PYN含量的增加呈现先增大后减小的趋势。

关键词：Pb(Yb1/2Nb1/2)O3-Pb(Zr0.35Ti0.65)O3；X射线衍射分析；钙钛矿结构；居里温度；电学性能

Abstract: Due to the excellent performance at high temperatures, high-Curie temperature piezoelectric materials have been applied widely in many fields, such as aerospace industry, nuclear energy, metallurgy industry, and petroleum and chemical industry. In this experiment, xPb(Yb1/2Nb1/2)O3-(1-x)Pb(Zr0.35Ti0.65)O3 (xPYN-(1-x)PZT) ferroelectric ceramics were prepared by the conventional solid-state reaction method via the wolframite precursor route sintered at different temperatures. XRD measurement confirmed that the synthesized xPYN-(1-x)PZT (x=0.025-0.15) ceramics exhibit rather pure tetragonal perovskite structure. At the same sintering conditions, the 0.075PYN-0.925PZT ceramics exhibit the largest density, which reaches 92.24% of the theoretical density. The xPYN-(1-x)PZT ceramics exhibit rather sharp dielectric response peaks. With the increase of the content of Pb(Yb1/2Nb1/2)O3 (PYN), the Curie temperature of the xPYN-(1-x)PZT ceramics increases almost linearly. The xPYN-(1-x)PZT ceramics exhibit typical P-E hysteresis loops. The 0.125PYN-0.875PZT ceramics exhibit excellent ferroelectric properties, in which the remnant polarization is 20.40C/cm2 and coercive field is 37.75kV/cm. Piezoelectric constant d33 of the xPYN-(1-x)PZT ceramics is small except for the 0.125PYN-0.874PZT ceramics, which reaches 68pC/N. With the increase of the content of PYN, the values of Qm, Kp and Kt exhibit the tendency to increase firstly and then decrease slightly.

Key words：Pb(Yb1/2Nb1/2)O3-Pb(Zr0.35Ti0.65)O3; X-ray diffraction analysis; perovskite structure; Curie temperature; electrical properties