@article{onodera_understanding_2019, 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 ({SiO}2) 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.}, author = {Onodera, Yohei and Kohara, Shinji and Tahara, Shuta and Masuno, Atsunobu and Inoue, Hiroyuki and Shiga, Motoki and Hirata, Akihiko and Tsuchiya, Koichi and Hiraoka, Yasuaki and Obayashi, Ippei and Ohara, Koji and Mizuno, Akitoshi and Sakata, Osami}, date = {2019}, doi = {10.2109/jcersj2.19143}, journaltitle = {Journal of the Ceramic Society of Japan}, keywords = {1 - Amorphous materials, 1 - Chemistry, 1 - Glass, 2 - Persistence diagrams, 2 - Persistent homology, 3 - X-ray diffraction}, number = {12}, pages = {853--863}, title = {Understanding diffraction patterns of glassy, liquid and amorphous materials via persistent homology analyses}, volume = {127} }