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中文摘要：
探讨Nb2O5掺杂对Pb1-xLax（ZryTi1-y）1-x／4O3（x=7％，0〈y〈1）（简称PLZT）压电陶瓷性能影响。通过X射线衍射及扫描电镜分析Pb1-xLax（ZryTi1-y）1-x／4O3＋0．5％Nb2O5陶瓷的相组成和显微结构。结果表明：合成温度1060℃时，可以得到钙钛矿结构。随着Nb2O5掺杂量的增大，四方相的含量减少，准同型相界向三方相移动。掺杂Nb2O5的质量分数为0．5％，Zr／Ti=57．5／42．5时，得到的压电陶瓷介电、压电性能最优，ε^T33／ε0=3100，tanδ=1．96％，d33=550PC／N，Kp=0．67。
英文摘要：
The effects of Nb2O5 on the properties of lead antimony-manganese zirconate titanate Pb1-xLax（ZryTi1-y）1-x/4O3 ceramics were studied, and the phase and microstructure were investigated by XRD, and SEM. Pure perovskitic structure was obtained by calcinated at 1060℃. A higher Nb content in the ceramics increased the amount of rhombohedral phases and the morphotropic phase boundary shifted towards the rhombohedral phase. The ceramics of Nb2O5 0.5wt.% and Zr/Ti of 57.5/42.4 have the relative dielectric constantε^T33/ε0 of 3100, dielectric loss tanδ of 1.96%, piezoelectric constant d33 of 550pC/N and the planar coupling factor Kp of 0.67.
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