夹杂对铁电颗粒畴结构及性能的影响

Impacts of Inclusion on the Domain Structure and Properties of Ferroelectric Particles

采用相场方法模拟了内含夹杂的铁电颗粒的畴结构演化,研究了夹杂对铁电颗粒畴结构和性能的影响.研究发现,铁电极化电荷在夹杂表面的聚集可导致电势的局部升高或降低,改变退极化电场,影响夹杂边界区域的极化矢量的生长和偏转,会增加畴结构的无序度;该影响在夹杂数量较多以及尺寸较大时尤为明显.最后,通过模拟电滞回线发现了颗粒的铁电性随夹杂的增加显著减弱的现象.因此,在微型电子器件的应用中应尽量避免在铁电颗粒中出现夹杂.

This work studied the impacts of non-ferroelectric inclusion on the domain structure and properties of a ferroelectric particle by simulating the domain evolution using phase field method.It is found that the accumulation of polarization charge at the surface of inclusion may lead to local rising or descending of electric potential,which further alters the depolarization electric field,impacts the switching and nucleation of polarization near the inclusion,and finally results in more disordered domain structure.This impact is particularly significant for large inclusions and multiple inclusions.Finally,it is found that the ferroelectricity of the particle decreases significantly with respect to increasing ratio of inclusion by simulating the hysteresis loop,indicating that inclusion in ferroelectric particle should be avoided as possible as we can in the application of microelectronics.