论文标题
多晶PB（ZR0.7TI0.3）中的域壁元边界相互作用O3压电
Domain wall-grain boundary interactions in polycrystalline Pb(Zr0.7Ti0.3)O3 piezoceramics
论文作者
论文摘要
在铁电膜和双晶中广泛研究了晶界与域壁之间的相互作用。然而，这种知识尚未转移到多晶陶瓷，其中晶粒大小代表了定制介电和机电响应的强大工具。在这里，我们将散装多晶PB（ZR0.7TI0.3）O3的介电和机电特性的变化与与晶界的域壁相互作用。制备具有3.9-10.4微米范围内的晶粒大小的样品，并研究了其微观结构，晶体结构和介电/机电特性。晶粒尺寸减少，伴随着大信号机电特性的降低以及小信号介电介电常数的增加。高能量衍射分析显示，在减少晶粒尺寸的情况下，微晶体增加了，而压电响应力显微镜表明，近路边界附近的局部强制电压增加。因此，性质的变化与接近显示域壁动力学降低的晶界的紧张材料体积有关。
Interactions between grain boundaries and domain walls were extensively studied in ferroelectric films and bicrystals. This knowledge, however, has not been transferred to polycrystalline ceramics, in which the grain size represents a powerful tool to tailor the dielectric and electromechanical response. Here, we relate changes in dielectric and electromechanical properties of a bulk polycrystalline Pb(Zr0.7Ti0.3)O3 to domain wall interactions with grain boundaries. Samples with grain sizes in the range of 3.9 - 10.4 micrometers were prepared and their microstructure, crystal structure, and dielectric/electromechanical properties were investigated. A decreasing grain size was accompanied by a reduction in large-signal electromechanical properties and an increase in small-signal dielectric permittivity. High-energy diffraction analysis revealed increasing microstrains upon decreasing the grain size, while piezoresponse force microscopy indicated an increased local coercive voltage near grain boundaries. The changes in properties were thus related to strained material volume close to the grain boundaries exhibiting reduced domain wall dynamics.
