Lead-free piezoelectric ceramics vs. PZT?
Lead-free piezoelectric ceramics vs. PZT?
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DOI：
10.1109/isaf.2006.4349278
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发表时间：
2006-07
影响因子：
1.7
通讯作者：
Shujun Zhang;R. Xia;T. Shrout
中科院分区：
文献类型：
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作者：
Shujun Zhang;R. Xia;T. Shrout
在无铅压电陶瓷的研究发展中，最近声称其性能可与pzt基材料相媲美。在这项工作中，对比了各种系统的介电和压电性能与各自的居里温度的关系。与PZT类似，在Na，BiTiO3 - batio3和K，BiTiO3三元体系中，MPB组分的性能得到了增强，但性能明显低于PZT。铁电到反铁电跃迁的结果远低于TC进一步限制了它们的用途。虽然可以与TC相比较，但在K，NaNbO3家族中报道的增强性能是与托托-四方多晶相变相关的极化率增加的结果，而不是像广泛报道的那样来自MPB。正如预期的那样，与MPB系统所观察到的不同，这些特性与温度有很强的相关性。
Investigations in the development of lead-free piezoelectric ceramics have recently claimed properties comparable to that of PZT-based materials. In this work, the dielectric and piezoelectric properties of the various systems were contrasted in relation to their respective Curie temperatures. Analogous to PZT, enhanced properties are noted for morphotropic phase boundary (MPB) compositions in the Na,BiTiO3–BaTiO3 and the ternary system with K,BiTiO3, but offer properties significantly lower than that of PZTs. The consequence of a ferroelectric to antiferroelectric transition well below TC further limits their usefulness. Though comparable with respect to TC, enhanced properties reported in the K,NaNbO3 family are the result of increased polarizability associated with the Torthor-tetragonal polymorphic phase transition being compositionally shifted downward and not from a MPB as widely reported. As expected, the properties are strongly temperature dependent unlike that observed for MPB systems.