相图
材料科学
高压
多面体
物理
相(物质)
结晶学
热力学
化学
组合数学
量子力学
数学
作者
Motohiko Murakami,Shinji Kohara,Naoto Kitamura,Jaakko Akola,Hiroyuki Inoue,Akihiko Hirata,Yasuaki Hiraoka,Yohei Onodera,Ippei Obayashi,Janne Kalikka,Naohisa Hirao,Tiziana Musso,Adam S. Foster,Yasushi Idemoto,Osami Sakata,Yasuo Ohishi
出处
期刊:Physical review
日期:2019-01-29
卷期号:99 (4)
被引量:44
标识
DOI:10.1103/physrevb.99.045153
摘要
High-pressure synthesis of denser glass has been a longstanding interest in condensed-matter physics and materials science because of its potentially broad industrial application. Nevertheless, understanding its nature under extreme pressures has yet to be clarified due to experimental and theoretical challenges. Here we reveal the formation of $\mathrm{OS}{\mathrm{i}}_{4}$ tetraclusters associated with that of $\mathrm{Si}{\mathrm{O}}_{7}$ polyhedra in $\mathrm{Si}{\mathrm{O}}_{2}$ glass under ultrahigh pressures to 200 gigapascal confirmed both experimentally and theoretically. Persistent homology analyses with molecular dynamics simulations found increased packing fraction of atoms whose topological diagram at ultrahigh pressures is similar to a pyrite-type crystalline phase, although the formation of tetraclusters is prohibited in the crystalline phase. This critical difference would be caused by the potential structural tolerance in the glass for distortion of oxygen clusters. Furthermore, an expanded electronic band gap demonstrates that chemical bonds survive at ultrahigh pressure. This opens up the synthesis of topologically disordered dense oxide glasses.
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