铁电体中新畴成核经典模型的改进

新畴成核是外加低场下铁电体中铁电畴反转的一个重要的过程.首先介绍了新畴成核的经典模型，采用该模型研究了铁电畴反转的新畴成核过程，发现理论计算的成核速率与外场关系和实验观测结果不一致.在Tagantsev模型的基础上，选取不同的成核形状对新畴成核的经典模型进行了改进，并获得了和实验观测相符的理论计算结果. 关键词： 铁电体 铁电畴 成核速率

Improvement on the classical model for new domain nucleation in ferroelectrics

The new-domain nucleation by applying a weak electric field is an important process for the ferroelectric domain inversion in ferroelectrics. We studied the process of the new-domain nucleation in ferroelectrics using the classical model, and found that the rate of nucleation in the electric field did not agree with the experimental result. Based on Tagantsevs model, we improved the classical model of the new-domain nucleation using a long flat dagger model instead of the ellipse model. Using the improved model, the result of the theoretical calculation agreed well with the experimental measurement.