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首页> 外文期刊>Crystal growth & design >Growth of well-defined cubic hematite single crystals: Oriented aggregation and Ostwald ripening
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Growth of well-defined cubic hematite single crystals: Oriented aggregation and Ostwald ripening

机译：明确的立方赤铁矿单晶的生长：定向聚集和奥斯特瓦尔德熟化

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摘要

Single-crystalline alpha-Fe2O3 submicron cubes with a well-defined shape have been successively synthesized via a simple hydrothermal process. X-ray. diffraction patterns, transmission electron microscopy, field emission scanning electron microscopy, and selected area electron diffraction patterns were applied to characterize the as-synthesized samples. The results indicate that the growth of single-crystalline alpha-Fe2O3 cubes can be attributed to cooperation of two principal mechanisms: oriented aggregation and Ostwald ripening. At the beginning, alpha-Fe2O3 nanorods were first fabricated and formed cube-like aggregation following a "one-dimensional (ID) -> three-dimensional (3D)" mode, in which these nanorods orientedly aggregated on the surfaces of some cores by sharing common {012} faces. Then, the resulting polycrystalline aggregates would fuse into a single crystal, in which Ostwald ripening process was expected to carry out because oriented aggregation alone cannot result in well-defined alpha-Fe2O3 cubes. The extended particle would further attract free-standing alpha-Fe2O3 nanorods to orientedly attach on their surface, and the fusion process was repeated until nanorods were completely consumed. This kind of cooperation of two basic mechanisms may give us a new insight into the growth of alpha-Fe2O3 crystals and opens a new way for controllable synthesis of other well-defined crystals in morphology and dimensionality.
机译：已经通过简单的水热工艺相继合成了形状明确的单晶α-Fe2O3亚微米立方体。 X光片衍射图谱，透射电子显微镜，场发射扫描电子显微镜和选择区域电子衍射图谱用于表征合成后的样品。结果表明，单晶α-Fe2O3立方体的生长可以归因于两个主要机理的合作：定向聚集和奥斯特瓦尔德成熟。最初，首先按照“一维（ID）->三维（3D）”模式制造α-Fe2O3纳米棒并形成立方体状的聚集体，其中这些纳米棒通过以下方式定向聚集在某些核的表面上：共享常见的{012}面孔。然后，生成的多晶聚集体将融合成一个单晶，由于单独的定向聚集不能产生明确定义的α-Fe2O3立方体，因此有望进行Ostwald成熟过程。延伸的粒子将进一步吸引独立的α-Fe2O3纳米棒定向定向附着在其表面，并且重复融合过程，直到纳米棒被完全消耗。两种基本机制的这种合作可能使我们对α-Fe2O3晶体的生长有了新的认识，并为可控合成其他形态和尺寸明确的晶体开辟了一条新途径。

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