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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Structural evolution in the nanoscale diffusion process: a Au-Sn bimetallic system
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Structural evolution in the nanoscale diffusion process: a Au-Sn bimetallic system

机译:纳米级扩散过程中的结构演化:Au-Sn双金属系统

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This work shows the structural evolution of a Au-Sn bimetallic system during the nanoscale diffusion process. Based on X-ray absorption. ne structure (XAFS) spectroscopy, X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM) and energy dispersive X-ray spectrometry (EDX), insights were obtained into the detailed composition and structure of the Au-Sn bimetallic system, demonstrating the sequential formation of stable Au/AuSn, AuSn, AuSn/AuSn2 and AuSn2 nanocrystals (Au/AuSn and AuSn/AuSn2 refer to core/shell structures) rather than disordered alloys or alloys with an equal Sn atomic distribution. Furthermore, the formation mechanism of Au-Sn intermetallic compounds and their core/shell structures are discussed. Through elucidating the structural evolution in the diffusion process, we can easily guide the design of other novel bimetallic phases and their core/shell structures which could be predicted between the noble metals (Cu, Ag, Au) and the IIIA or IVA (In, Sn, Pb) metallic elements owing to the rapid diffusion mechanism.
机译:这项工作表明了纳米扩散过程中金锡双金属体系的结构演变。基于X射线吸收。结构(XAFS)光谱,X射线衍射(XRD),高分辨率透射电子显微镜(HRTEM)和能量色散X射线光谱(EDX),获得了对Au-Sn双金属的详细组成和结构的见解系统,证明了顺序形成稳定的Au / AuSn,AuSn,AuSn / AuSn2和AuSn2纳米晶体(Au / AuSn和AuSn / AuSn2是指核/壳结构),而不是无序合金或具有相等Sn原子分布的合金。此外,讨论了金锡金属互化物的形成机理及其核/壳结构。通过阐明扩散过程中的结构演变,我们可以轻松地指导其他新型双金属相及其核/壳结构的设计,这可以在贵金属(Cu,Ag,Au)与IIIA或IVA(In, Sn,Pb)由于快速扩散机制而成为金属元素。

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