Abstract
We found that 90° domain walls are absorptive to oxygen vacancies and the absorbing degree was related with the morphology of 90° domain walls: curved 90° domain walls are more absorptive to oxygen vacancies compared with straight 90° domain walls. Therefore, in ferroelectric materials with curved 90° domain walls, the density of oxygen vacancies diffusing to and subsequently pinning the 180° domain walls is greatly suppressed, resulting in their excellent fatigue resistance.