Direct synthesis of Nb-Al intermetallic nanoparticles by sodiothermic homogeneous reduction in molten salts

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• 作者：Na Wang ; Chao Du ; Jungang Hou ; Yao Zhang ; Kai Huang ; Shuqiang Jiao ; Hongmin Zhu
• 关键词：A. Niobium aluminides ; A. Nanostructured intermetallics ; C. Reaction synthesis ; F. Diffraction ; F. Electron microscopy ; scanning ; F. Electron microscopy ; transmission
• 刊名：Intermetallics
• 出版年：2013
• 出版时间：December, 2013
• 年：2013
• 卷：43
• 期：Complete
• 页码：45-52
• 全文大小：2611 K

文摘

Nb-Al intermetallic nanoparticles were directly synthesized via sodiothermic reduction process in molten salts using NbCl₅ and AlCl₃ as the raw materials. The as-prepared samples were characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The NbCl₅ and AlCl₃ were dissolved in LiCl-KCl-CaCl₂ or LiCl-KCl-NaCl-CaCl₂ molten salts forming a homogeneous system. It was found that a series of intermetallic nanoparticles, such as Nb₃Al, Nb₂Al, NbAl₃ and Nb₂Al/NbAl₃, were successfully synthesized at low temperature of 350-500?¡ãC using the homogeneous molten salt systems. The phase transformations of Nb₃Al, Nb₂Al and NbAl₃, were achieved via the controllable variation of molar ratio of Nb to Al. Furthermore, the influence of the reaction temperature on the particle size of the intermetallic nanoparticles was also investigated.