By congruent ordering, a nonstoichiometric single ordered phase is produced with the order domains being separated by antiphase domain boundaries (APBs).
等成分有序化产生非化学计量比的单相有序畴，并被反相畴界分开。
2
Dislocations can change the antiphase relationship of the two growing domains and thus can act as a trap to APB, making APB terminate at the dislocation.