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首页> 外文会议>Symposium on Spatially Resolved Characterization of Local Phenomena in Materials and Nanostructures Dec 2-6, 2002 Boston, Massachusetts, U.S.A. >Microstructure of precipitated Au Nanoclusters in Single Crystal MgO
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Microstructure of precipitated Au Nanoclusters in Single Crystal MgO

机译：单晶MgO中析出的金纳米团簇的微观结构

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摘要

Gold nanoclusters dispersed in single crystal MgO were prepared by ion implantation and subsequent annealing at 1000℃. The morphological feature, size, crystallographic orientation of the Au nanoclusters with respect to the MgO matrix, and the interface structure between the Au nanoclusters and MgO were investigated using transmission electron microscopy. During annealing, the Au clusters nucleate coherently in the MgO lattice, leading to an epitaxial orientation relationship of [010]_(MgO)// [010]_(Au) and (200)_(MgO)//(200)_(Au) that is maintained for all the Au clusters. A critical size for the coherent-semicoherent interface transition is observed to be in the range from ～5 to 8 nm for Au clusters in MgO. Au clusters larger than this critical size exhibit faceting on the {001} planes. The precipitated Au also exhibits internal dislocations.
机译：通过离子注入和随后在1000℃下退火来制备分散在MgO单晶中的金纳米团簇。利用透射电子显微镜研究了金纳米团簇相对于MgO基体的形态特征，尺寸，晶体学取向以及金纳米团簇与MgO之间的界面结构。在退火过程中，Au团簇在MgO晶格中相干成核，导致[010] _（MgO）// [010] _（Au）和（200）_（MgO）//（200）_的外延取向关系为所有Au群集维护的（Au）。对于MgO中的Au团簇，相干-半相干界面过渡的临界尺寸在〜5至8 nm范围内。大于此临界尺寸的金团簇在{001}平面上呈现出切面。沉淀的Au也表现出内部位错。

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