采用自发成核方法,以NaCl-Na2CO3为助熔剂,生长了毫米级的NaCo2O4晶体.通过X射线衍射对晶体作了表征.利用扫描电子显微镜和原子力显微镜研究了晶体的形貌和生长机理.结果表明:所得晶体是NaCo2O4,属于六方晶系,晶胞参数:a =b =0.2842 nm,c=1.0894 nm,V=0.0761997 nm3.NaCo2O4晶体是沿c轴层状生长的,同时从阴离子配位多面体的角度分析了晶体的形貌.
Millimetre-sized NaCo2O4 crystals were grown from a molten flux based on NaCl-Na2CO3 by spontaneous nucleation method.Details of the preparation and growth procedures are provided.The asgrown crystals were characterized by X-ray powder diffraction (XRPD).The morphology and growth mechanism were investigated by scanning electron microscopy (SEM) and atomic force microscopy (AFM).The results show that the obtained crystal are well crystallized and indexed in a hexagonal crystal system with lattice parameters a =b =0.2842 nm,c =1.0894 nm,and V =0.0761997 nm3.The growth of NaCo2O4 single crystals was controlled by a two-dimensional (2D) layer-by-layer mechanism acting along the c-axis.Furthermore,the morphology of the crystals was also interpreted in the viewpoint of anionic coordination polyhedron growth units.
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