【摘要】 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.更多还原

【Abstract】 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.更多还原