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首页> 外文期刊>Crystal growth & design >Macroscopic Orientation Domains Grown via Aerodynamic Levitation: A Path toward Single Crystals
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Macroscopic Orientation Domains Grown via Aerodynamic Levitation: A Path toward Single Crystals

机译：通过空气动力学悬浮生长的宏观取向域：单晶的路径

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摘要

Powder pellets of ca. 30 mg with the mol % composition 0.61Ga(2)O(3)0.39La(2)O(3) are levitated in a gas stream and melted using a pair of CO2 lasers. The levitating melt droplets crystallize to form La2Ga3O7.5 or LaGaO3 after the lasers are turned off. The microstructure of cross sections prepared from them is analyzed using scanning electron microscopy and electron back-scatter diffraction. One of the beads containing La2Ga3O7.5 shows a fully crystallized, polycrystalline microstructure, whereas the other broke apart during cooling, and its cross section shows only a single orientation domain which is more than 7 mm(2) in area. Solid-state Ga-71 NMR spectroscopy was applied to this sample and showed that it was not a single crystal but contains only about 3 orientation domains. The bead containing LaGaO3 showed dendritic growth originating from multiple nuclei. Although a single crystal was not achieved by the applied experiments so far, a detailed correlation of measured cooling curves with the observed microstructures enables devising steps along the path toward single crystal production in future experiments.
机译：将摩尔百分比为0.61Ga（2）O（3）0.39La（2）O（3）的约30 mg粉末颗粒悬浮在气流中，并使用一对CO2激光器熔化。悬浮的熔融液滴结晶形成La2Ga3O7。5或LaGaO3，在激光器关闭后。利用扫描电子显微镜和电子背散射衍射分析了由它们制备的横截面的微观结构。一种含有La2Ga3O7的珠子。5显示完全结晶的多晶微观结构，而另一个在冷却过程中断裂，其横截面仅显示面积超过7 mm（2）的单一取向畴。对该样品进行了固态Ga-71核磁共振波谱分析，结果表明该样品不是单晶，但仅包含约3个取向域。含有LaGaO3的珠子显示出源自多个细胞核的树突生长。尽管迄今为止应用的实验尚未获得单晶，但通过测量的冷却曲线与观察到的微观结构的详细关联，可以在未来的实验中沿着单晶生产的道路设计步骤。

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