研究了ＰＭＮ－ＰＴ陶瓷在准同型相界（ＭＰＢ）区域、不同烧结温度下，化学组成、相组成对陶瓷压电性能的影响．发现对于同一化学组成的陶瓷，随着烧结温度的上升，发生了菱方相→四方相的相转变，同时随着菱方相、四方相相比例的接近，陶瓷的压电性能有显著的提高．而在不同烧结温度下，最佳压电性能所对应的化学组成有微小的变化．据此认为，陶瓷的压电性能不仅与化学组成有关，而且与相组成也密切相关，随着烧结温度的变化，发生了准同型相界的微小移动
The influence of chemical and phase composition on the piezoelectric properties of PMN-PT ceramics with
chemical compositions near the morphotropic phase boundary(MPB) sintered at different temperatures was investigated. It showed that a phase
conversion from rhombohedral to tetragonal phase took place when the sintering temperature of PMN-PT ceramic with a definite chemical composition increased.
Meanwhile, the piezoelectric properties of PMN-PT ceramics were significantly enhanced when the amount of rhombohedral phase approached to that of tetragonal
phase in ceramics. At the same time, it was discovered that the chemical composition corresponding to optimal piezoelectric properties varied with the
change of sintering temperature. Based on above results, the authors found that the piezoelectric properties of PMN-PT near the MPB are not only related
to the chemical composition but also significantly impacted by the phase composition in ceramics. With the change of sintering temperature, the MPB
of PMN-PT ceramic system shifts slightly.
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