Morphology evolution of NaTaO3 submicrometer single-crystals: from cubes to quasi-spheres
Morphology evolution of NaTaO3 submicrometer single-crystals: from cubes to quasi-spheres
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DOI：
10.1007/s40843-015-0041-6
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发表时间：
2015-04
期刊：
影响因子：
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通讯作者：
W. Chen;Q. Kuang;Zhaoxiong Xie
中科院分区：
文献类型：
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作者：
W. Chen;Q. Kuang;Zhaoxiong Xie
功能性纳米/微晶的表面结构控制引起了极大的关注，因为许多重要的物理化学性质取决于其表面。在我们最近提出的依赖过饱和的表面结构演化策略的指导下，通过改变复合溶剂中乙二醇与水的体积比和NaOH的量，可以合成具有立方体、角截角立方体、棱角截角立方体和准球形形态的NaTaO3亚微米晶体。在低过饱和条件下，得到了具有低能量{100}面的NaTaO3立方晶体。随着过饱和度的增加，具有较高表面能的NaTaO3立方晶体的角部和边缘逐渐被截断。令人惊讶的是，准球形微晶是在极高的过饱和条件下形成的，这是经典晶体生长理论难以解释的。通过分析二维晶核的形成功，我们得出结论：在极高的过饱和度下晶体生长趋于各向同性，这很好地解释了准球形微晶的形成。
Surface structure control of functional nano-/micro-crystallites has attracted great attention because many important physicochemical properties depend on their surface. Guided by the supersaturation-dependent surface structure evolution strategy we proposed recently, NaTaO3submicrometer crystals with morphologies of cubes, corner truncated cubes, edge and corner truncated cubes, and quasi-spheres can be synthesized by changing the volume ratio of ethylene glycol to water and the amount of NaOH in the composite solvent. Under low supersaturation condition, NaTaO3cubic crystals with low energy {100} facets were obtained. As the supersaturation increases, the corners and edges of NaTaO3cubic crystals, which possess higher surface energy, were gradually truncated. Surprisingly, quasi-sphere crystallites formed under extremely high supersaturation condition, which is difficult to be explained by the classical crystal growth theories. By analyzing the formation work of two-dimension crystal nuclei, we concluded that the crystal growth tend to be isotropic at extremely high supersaturation, which well explained the formation of the quasi-sphere crystallites.