Structural evolution in the nanoscale diffusion process: a Au-Sn bimetallic system.
Structural evolution in the nanoscale diffusion process: a Au-Sn bimetallic system.
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纳米级扩散过程中的结构演化：Au-Sn 双金属系统。
DOI：
10.1039/b916215a
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发表时间：
2009
影响因子：
4
通讯作者：
Yi Xie
中科院分区：
文献类型：
--
作者：
Kuai Yu;T. Yao;Z. Pan;Shiqiang Wei;Yi Xie
这项工作显示了在纳米级扩散过程中的Au-Sn双金属系统的结构演变。基于X射线吸收精细结构（XAFS）光谱、X射线衍射（XRD）、高分辨透射电子显微镜（HRTEM）和能量色散X射线光谱（EDX），获得了Au-Sn三元体系的详细组成和结构，证明了稳定的Au/AuSn，AuSn，AuSn/AuSn（2）和AuSn（2）纳米晶体（Au/AuSn和AuSn/AuSn（2）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。讨论了Au-Sn金属间化合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，我们可以很容易地指导其他新的非晶相的设计和它们的核/壳结构，可以预测贵金属（Cu，Ag，Au）和IIIA或IVA（In，Sn，Pb）金属元素之间由于快速扩散机制。
This work shows the structural evolution of a Au-Sn bimetallic system during the nanoscale diffusion process. Based on X-ray absorption fine 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/AuSn(2) and AuSn(2) nanocrystals (Au/AuSn and AuSn/AuSn(2) 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.
影响因子：
8.6
作者：
Cable, RE;Schaak, RE
通讯作者：
Schaak, RE