Ｐｄ系金属ガラスの相分離組織に関する微視的観察

金属玻璃在SRO以外的结构秩序（近程秩序）已经被广泛讨论。尽管x射线和中子衍射谱提供了金属玻璃中MRO（中量程有序）存在的有力指示，但从宽衍射峰得到的平均结构信息不能提供真实空间中真实原子排列的一致结构信息。经典的MD和从头算MD模拟已被证明是确定金属玻璃中SRO的有效方法，然而，MD模拟需要太长时间才能揭示MRO的形成。我们已经成功地开发了扫描ABED（埃束电子衍射），这可能是唯一能够通过提供具有0.2 nm高空间分辨率的非平均二维衍射图来实验阐明SRO以外金属玻璃中的原子排列的技术。该扫描ABED揭示了金属玻璃的MRO，并基于实验数据构建了合理的MRO模型。

The structural order of metallic glasses beyond SRO (short-range order) has been intensely discussed before. Although X-ray and neutron diffraction profiles provide strong indication of the existence of MRO (medium-range order) in metallic glasses, the average structure information derived from broad diffraction peaks cannot provide consistent structure information on true atomic arrangements in real space. Classical MD and ab initio MD simulations have been proved to be effective in determining SRO in metallic glasses, however, the MD simulation takes too long time to reveal formation of MRO.We have successfully developed scanning ABED (angstrom beam electron diffraction), which is probably the only technique that is capable of experimentally elucidating the atomic arrangements in metallic glasses beyond SRO by providing non-averaged two dimensional diffraction patterns with a high spatial resolution of 0.2 nm. This scanning ABED unravels MRO of metallic glasses and constructed plausible MRO models based on the experimental data.