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タイトル: | Understanding diffraction patterns of glassy, liquid and amorphous materials via persistent homology analyses |
著者: | ONODERA, Yohei https://orcid.org/0000-0002-3080-6991 (unconfirmed) KOHARA, Shinji TAHARA, Shuta MASUNO, Atsunobu https://orcid.org/0000-0003-0667-9782 (unconfirmed) INOUE, Hiroyuki SHIGA, Motoki HIRATA, Akihiko TSUCHIYA, Koichi HIRAOKA, Yasuaki https://orcid.org/0000-0002-1023-2687 (unconfirmed) OBAYASHI, Ippei OHARA, Koji MIZUNO, Akitoshi SAKATA, Osami |
著者名の別形: | 小野寺, 陽平 |
キーワード: | Glass Liquid Amorphous materials Structure X-ray diffraction Neutron diffraction Topology Persistent homology |
発行日: | 1-Dec-2019 |
出版者: | Ceramic Society of Japan |
誌名: | Journal of the Ceramic Society of Japan |
巻: | 127 |
号: | 12 |
開始ページ: | 853 |
終了ページ: | 863 |
抄録: | The structure of glassy, liquid, and amorphous materials is still not well understood, due to the insufficient structural information from diffraction data. In this article, attempts are made to understand the origin of diffraction peaks, particularly of the first sharp diffraction peak (FSDP, Q₁), the principal peak (PP, Q₂), and the third peak (Q₃), observed in the measured diffraction patterns of disordered materials whose structure contains tetrahedral motifs. It is confirmed that the FSDP (Q₁) is not a signature of the formation of a network, because an FSDP is observed in tetrahedral molecular liquids. It is found that the PP (Q₂) reflects orientational correlations of tetrahedra. Q₃, that can be observed in all disordered materials, even in common liquid metals, stems from simple pair correlations. Moreover, information on the topology of disordered materials was revealed by utilizing persistent homology analyses. The persistence diagram of silica (SiO₂) glass suggests that the shape of rings in the glass is similar not only to those in the crystalline phase with comparable density (α-cristobalite), but also to rings present in crystalline phases with higher density (α-quartz and coesite); this is thought to be the signature of disorder. Furthermore, we have succeeded in revealing the differences, in terms of persistent homology, between tetrahedral networks and tetrahedral molecular liquids, and the difference/similarity between liquid and amorphous (glassy) states. Our series of analyses demonstrated that a combination of diffraction data and persistent homology analyses is a useful tool for allowing us to uncover structural features hidden in halo pattern of disordered materials. |
著作権等: | ©2019 The Ceramic Society of Japan This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by-nd/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
URI: | http://hdl.handle.net/2433/251043 |
DOI(出版社版): | 10.2109/jcersj2.19143 |
出現コレクション: | 学術雑誌掲載論文等 |
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