Multiferroic materials possess both magnetism and ferroelectricity, or a permanent electric polarization.
多铁性材料兼具磁性和铁电性，或者可以说成是永久电力极化特性。
2
With decreasing grain sizes, its crystal structure, ferroelectricity and phase transition temperature all indicated the character of size effect.
随着晶粒尺寸的减小，它的晶体结构、铁电性和相变温度等都表现出尺寸效应。
3
The ultrathin materials which show ferroelectricity and the thickness of which is from several ten nanometers to a few microns are called ferroelectric thin film.