短程有序性
短程有序性-
因此时效问题的研究对于铁电材料的理论研究和应用前景都有着重要的意义。最近，报道指出晶体中点缺陷具有短程有序对称性遵循的普适性原理（简称点缺陷对称性原理）。
Thus the study of ferroelectric aging is an important issue both for applications and for a fundamental understanding . Recently , a general symmetry-conforming principle for point defects ( defect symmetry principle for short ) has been proposed in ferroelectrics .