通过扫描电镜 (SEM)观察了PMP样品的结晶前沿形貌 ,并发现了平面式生长方式。提拉速度从 1～ 4mm·h- 1 ,样品的生长方式均为平面式生长。提拉速度慢的样品结晶前沿较平整 ,但 2 11粒度明显增加。沿c轴方向生长界面没有沿ab方向平整 ,离基体较近的液相中有临时相出现 ,并首次发现台阶式生长方式。台阶非常细小 ,大约 2～ 3 μm。PMP样品Y在液相中的起始浓度很低 ,随着保温时间的延长 ,Y的浓度明显增加。Y的扩散距离为 1μm左右 ,12 3相很可能在距离 2 11相 1μm的范围内形核。 The crystal front morphology of the PMP samples was observed by scanning electron microscopy (SEM) and the planar growth pattern was found. Pull speed from 1 ~ 4mm · h-1, the growth of the sample are planar growth. Crystallization front of the sample with slow pulling speed is flat, but the particle size of 2 11 obviously increases. The growth interface along the c-axis is not smooth along the ab direction, and the temporary phase appears in the liquid phase near the matrix, and for the first time, the step-wise growth pattern is found. The steps are very small, about 2 ~ 3 μm. The initial concentration of PMP sample Y in the liquid phase is very low, and the concentration of Y increases significantly as the incubation time prolongs. The diffusion distance of Y is about 1 μm, and the 12 3 phase is likely to nucleate in a range of 1 11 μm from 1111.