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Title: Understanding diffraction patterns of glassy, liquid and amorphous materials via persistent homology analyses
Authors: ONODERA, Yohei  kyouindb  KAKEN_id
KOHARA, Shinji
TAHARA, Shuta
MASUNO, Atsunobu
INOUE, Hiroyuki
SHIGA, Motoki
HIRATA, Akihiko
TSUCHIYA, Koichi
HIRAOKA, Yasuaki  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-1023-2687 (unconfirmed)
OBAYASHI, Ippei
OHARA, Koji
MIZUNO, Akitoshi
SAKATA, Osami
Author's alias: 小野寺, 陽平
Keywords: Glass
Liquid
Amorphous materials
Structure
X-ray diffraction
Neutron diffraction
Topology
Persistent homology
Issue Date: 1-Dec-2019
Publisher: Ceramic Society of Japan
Journal title: Journal of the Ceramic Society of Japan
Volume: 127
Issue: 12
Start page: 853
End page: 863
Abstract: 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.
Rights: ©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(Published Version): 10.2109/jcersj2.19143
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