The influence of proton radiation on the achiral structural transition at 180° domain walls in tetragonal ferroelectric BaTiO₃ is theoretically studied in this work. The proton-induced oxygen vacancy in ferroelectrics is predicted using the Monte Carlo Simulations, which increases with the increase of the proton fluence and the energy of the incident proton. A model based on the LGD is developed to investigate the influence of oxygen vacancy which is considered as a defect dipole on the achiral structural transition of Bloch–Néel type of domain wall. Under the proton radiation, the Bloch-type of domain wall shows the character of asymmetric because of the coupling of the polarization and the electric field, while the proton radiation just changes the magnitude of the polarization in the Néel-type of domain wall.

质子辐射对四方铁电BaTiO ₃ 180°畴壁非手性结构转变的影响在这项工作中进行了理论研究。铁电体中质子诱导的氧空位使用蒙特卡罗模拟进行预测，随着质子注量和入射质子能量的增加而增加。开发了基于 LGD 的模型来研究氧空位（被视为缺陷偶极子）对 Bloch-Néel 型畴壁的非手性结构转变的影响。在质子辐射下，Bloch型畴壁由于极化和电场的耦合而表现出不对称的特性，而质子辐射只是改变了Néel型畴壁中极化的大小。