KDP晶体相变界面微观形貌及大台阶形成的AFM观察

摘要

采用原子力显微镜实时和非实时观察了不同过饱和度下 KDP 晶体(100)面相变界面微观形貌,观察到晶体从生长死区恢复生长的过程；首次得到大台阶形成过程的实时 AFM图像,解释了大台阶的形成机理；分析了台阶失稳的原因。结果表明,不同实验条件下,KDP(100)面相变界面均呈现为台阶面。在低过饱和度下,生长台阶来源于螺位错；在较高过饱和度下,层状台阶列来源于二维核。%The micro topography of phase interface of KDP (100)face under different supersaturation were inves-tigated by using in situ and ex situ AFM technique.The recovery of crystal growth from the dead zone was ob-served.The in situ AFM images of the generating process of the macrostep were obtained for the first time. The formation mechanism of macrostep was explained.The instability of the step was analyzed.The results show that the micro topography of phase interface of KDP (100)face under different experimental conditions all exhibited as stepped surfaces.The growth steps result from spiral dislocation at lower supersaturation,while layer step flows are yielded by two-dimensional nucleation at higher supersaturation.