ABSTRACT

Porous ferroelectric materials show great potential for achieving competitive dielectric/piezoelectric properties with light weight. In this study, a phase-field model was employed to simulate the ferroelectric domain structure evolution of porous barium titanate. It is suggested that the ferroelectric/dielectric/piezoelectric properties are strongly influenced by the porosity level and the size of pores for porous ceramics. It is demonstrated that the ferroelectric switching behaviour, the remnant polarisation, the dielectric constant and the piezoelectric constant are enhanced in nanoporous ferroelectrics with ellipse-shaped pores by introducing mechanisms of symmetry breaking. By providing a means of achieving enhanced properties, nanoporous ferroelectrics with ellipse-shaped pores may have a broad impact on the applications of ferroelectrics and enhance the utility of the materials for selected applications.

摘要

多孔铁电材料显示出实现具有竞争力的轻质介电/压电性能的巨大潜力。在这项研究中，采用相场模型来模拟多孔钛酸钡的铁电畴结构演变。这表明铁电/介电/压电性能受多孔陶瓷的孔隙率水平和孔隙大小的强烈影响。结果表明，通过引入对称破坏机制，具有椭圆形孔的纳米多孔铁电体中的铁电体开关行为、剩余极化、介电常数和压电常数得到增强。通过提供一种实现增强特性的方法，