用AFM观测凝胶法下KClO_4晶体的生长机理  

An atomic force microscopy study of the growth mechanism of a potassium perchlorate single crystal grown using the gel method

作　　者：陈淑仙[1] 

机构地区：[1]中国民航飞行学院航空工程学院,四川广汉618307

出　　处：《重庆大学学报（自然科学版）》2008年第7期815-819,共5页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(50376078);教育部新世纪优秀人才支持计划资助项目(NCET-05-0761)

摘　　要：用原子力显微镜(atomic force microscopy,AFM)对凝胶法生长的KClO4晶体的最重要面{001}面微观形貌进行了研究。结果表明,在不同的过饱和度下,KClO4晶体分别表现为二维成核生长、三维成核生长、层核生长以及多层堆垛生长等生长机理。从热力学角度解释了过饱和度对KClO4晶体生长机理的影响。对二维成核生长机理,揭示了KClO4晶体生长中二维核的形状和取向,及生长台阶的取向。研究结果还表明,杂质的存在将阻止台阶的向前推进,并导致聚并台阶及弯曲台阶的形成。Atomic force microscopy was employed to study the microtopography on the {001} surface of potassium perchlorate single crystals obtained by the gel method. This surface plays an !mportant role on the growth of potassium perchlorate single crystals. The results show that the potassium perchlorate single crystals display various growth mechanisms at different supersaturations, including the two-dimensional nucleation growth mechanism, three-dimensional nucleation growth mechanism, layer-nucleation growth mechanism and stack growth mechanism. The effects of supersaturations on the growth mechanisms could be understood from a thermodynamic viewpoint. The shape and orientation of the two-dimensional nuclei and the orientation of growth steps were observed. The results demonstrate that the impurities in the growth system display negative effects on the single crystal growth.

关 键 词：凝胶法 KClO4晶体 生长机理 AFM 

分 类 号：TK121[动力工程及工程热物理—工程热物理]