并非由外电场引起，而是由晶体内部结构引起的极化状态，称为自发极化。
...n）：电场作用下，电介质中束缚着的电荷发生位移或者极性按电场方向转动的现象，称为极化 自发极化（Spontaneous polarization）：在没有外电场作用时，晶体中存在着由于点偶极子的有序排列而产生 的极化，称为自发极化 铁电性：具有自发极化，并且自发极化能...
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Rare-earth substituted Bi_4Ti_3O_(12) thin films of layered-perovskite structure are of large spontaneous polarization and fatigue-free.
稀土掺杂的层状钙钛矿型Bi_4Ti_3O_(12)铁电薄膜自发极化大,抗疲劳。
参考来源 - 层状钙钛矿型Bi·2,447,543篇论文数据，部分数据来源于NoteExpress
畴壁的存在使自发极化和居里温度降低，使临界尺寸增大。
The existence of domain walls reduces both the spontaneous polarization and the Curie temperature, and increases the critical size.
此外，随退火温度升高，铁电薄膜的自发极化强度先增强后减弱。
The spontaneous polarization of ferroelectric films was strengthened and then weakened with the increasing of annealing temperature.
从相图上得知，外加应力可以改变薄膜的自发极化的极化方向及强度。
It is shown that the external stress may lead to the rotation of the spontaneous Ps and a gradual change of its magnitude.
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