Ｐｄ系金属ガラスの相分離組織に関する微視的観察

金属玻璃的短程有序（SRO）之外的结构有序性以前曾被广泛讨论过。虽然X射线和中子衍射曲线提供了金属玻璃中存在MRO（中程有序）的强有力的指示，但来自宽衍射峰的平均结构信息不能提供关于真实的空间中真实原子排列的一致结构信息。经典的分子动力学和从头算分子动力学模拟已经被证明是确定金属玻璃中SRO的有效方法，但是分子动力学模拟需要太长的时间来揭示MRO的形成。（埃束电子衍射），这可能是唯一的技术，是能够实验阐明原子的安排，在金属玻璃超越SRO，通过提供非-具有0.2nm的高空间分辨率的平均二维衍射图案。该扫描ABED揭示了金属玻璃的MRO，并根据实验数据建立了合理的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.