The determination of the atomic configuration of metallic glasses is a long-standing problem in materials science and solid-state physics1,2. So far, only average structural information derived from diffraction and spectroscopic methods has been obtained. Although various atomic models have been proposed in the past fifty years3,4,5,6,7,8, a direct observation of the local atomic structure in disordered materials has not been achieved. Here we report local atomic configurations of a metallic glass investigated by nanobeam electron diffraction combined with ab initio molecular dynamics simulation. Distinct diffraction patterns from individual atomic clusters and their assemblies, which have been theoretically predicted as short- and medium-range order6,7,8, can be experimentally observed. This study provides compelling evidence of the local atomic order in the disordered material and has important implications in understanding the atomic mechanisms of metallic-glass formation and properties.
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This work was sponsored by ‘Global COE for Materials Research and Education’, ‘World Premier International (WPI) Research Center Initiative for Atoms, Molecules and Materials’, MEXT, Japan. It was also partly supported by Grant-in-Aid for Scientific Research (S) (20226013) JSPS. We thank M. Hasegawa of Nagoya University for providing the Zr66.7Ni33.3 metallic-glass ribbons.
The authors declare no competing financial interests.
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Hirata, A., Guan, P., Fujita, T. et al. Direct observation of local atomic order in a metallic glass. Nature Mater 10, 28–33 (2011). https://doi.org/10.1038/nmat2897
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