弛豫体-反铁电体增强电致应变

Bi0.5Na0.5TiO3–SrTiO3，富BNT相呈现弛豫体行为；Bi0.5Na0.5TiO3–K0.5Na0.5NbO3，富BNT相存在反铁电相。这两种固溶体均呈现高的电致应变。通过复合得到Bi0.5Na0.5TiO3–SrTiO3–K0.5Na0.5NbO3固溶体，电致应变性能得到明显的增强，有望应用在驱动器方面获得应用。

在这个固溶体中，极性微区与原子占位对晶体结构影响明显。A位复合和B位复合可以降低体系的晶胞体积，同时导致纳米极性微区与反铁电微区并存。

Laijun Liu, Danping Shi, Michael Knapp, Helmut Ehrenberg, Liang Fang and Jun Chen, Large strain response based on relaxor-antiferroelectric coherence in Bi_0.5Na_0.5TiO₃-SrTiO_3-K_0.5Na_0.5)NbO₃ solid solutions, Journal of Applied Physics, 2014(116): 184104.

We thank Dr. Lin Chang (NWPU) for carrying out P-E loops and S-E curves. This work was financially supported

by the fellowship of the Helmholtz Association and the Karlsruhe Institute of Technology.