Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub 3/含量对MPB附近PMNN-PZT体系压电和介电性能的影响

Proceedings of the 13th IEEE International Symposium on Applications of Ferroelectrics, 2002. ISAF 2002. Pub Date : 2002-05-28 DOI:10.1109/ISAF.2002.1195948

Haiyan Chen, X. Guo, Wenbiao Wu, Z. Meng

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引用次数: 0

摘要

制备了Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub 3/-Pb(Mn/sub 1/3/Nb/sub 2/3/)O/sub 3/-PbZrO/sub 3/-PbTiO/sub 3/ (PMMN-PZT)含量不同的Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub 3/ (PMN)的四元压电陶瓷，其分布在亲晶相边界(MPB)附近。通过x射线衍射分析确定了体系的相结构。测试了材料的压电和介电性能。实验结果表明，该体系中四边形和菱形相共存的MPB在0.10 ~ 0.14mol% PM范围内具有较宽的组成范围。压电系数和机电耦合系数随PMN的增加而增大，在PMN添加量为12mol%时达到最大值，然后随着PMN添加量的增加而显著减小，而Qm随PMN添加量的变化趋势相反。介电常数在12mol% PMN时也达到最大值。结果表明，与烧结试样相比，正方相极化试样的介电常数增大，而菱形相极化试样的介电常数增大。介电性能的变化反映了从四方相到菱形相的转变。

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The influence of Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub 3/ content on the piezoelectric and dielectric properties of PMNN-PZT system near the MPB

Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub 3/-Pb(Mn/sub 1/3/Nb/sub 2/3/)O/sub 3/-PbZrO/sub 3/-PbTiO/sub 3/ (PMMN-PZT) quaternary piezoelectric ceramics with the various contents of Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub 3/ (PMN), which locate in the vicinity of the morphotropic phase boundary (MPB), were fabricated. The phase structure of the system was delineated by X-ray diffraction analysis. The piezoelectric and dielectric properties were also measured. Experimental results reveal that the MPB coexisting tetragonal and rhombohedral phases in the present system has a broad composition region from 0.10 to 0.14mol% PM. The piezoelectric coefficient and electromechanical coupling factor increase with increasing PMN and reach the maximum values at 12mol% PMN, then decrease remarkably with further PMN addition, whereas the variation of Qm with PMN addition shows the opposite trend. The dielectric constant also reaches the maximum value at 12mol% PMN. It is found that compared with the as-sintered samples, the dielectric constant of the poled samples in tetragonal phase increases, while there are contrary results in rhombohedral phase. The variation of dielectric properties reflects the transition from tetragonal phase to rhombohedral phase.

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Proceedings of the 13th IEEE International Symposium on Applications of Ferroelectrics, 2002. ISAF 2002.

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