By congruent ordering, a nonstoicheometric single ordered phase is produced with the ordered 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，失稳分解主要发生在反相畴界处，形成无序相，并促进畴内的失稳分解，在畴内形成无序相，但随时间延续，畴内无序相逐渐消失。 沉淀序列为：