Hot dense silica glass with ultrahigh elastic moduli.

Autor: Sun N; Laboratory of Seismology and Physics of Earth's Interior, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui, 230026, China.; CAS Center for Excellence in Comparative Planetology, University of Science and Technology of China, Hefei, Anhui, 230026, China.; Frontiers Science Center for Planetary Exploration and Emerging Technologies, University of Science and Technology of China, Hefei, Anhui, 230026, China., Mao Z; Laboratory of Seismology and Physics of Earth's Interior, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui, 230026, China. zhumao@ustc.edu.cn.; CAS Center for Excellence in Comparative Planetology, University of Science and Technology of China, Hefei, Anhui, 230026, China. zhumao@ustc.edu.cn.; Frontiers Science Center for Planetary Exploration and Emerging Technologies, University of Science and Technology of China, Hefei, Anhui, 230026, China. zhumao@ustc.edu.cn., Zhang X; Laboratory of Seismology and Physics of Earth's Interior, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui, 230026, China., Tkachev SN; Center for Advanced Radiation Sources, University of Chicago, Chicago, IL, 60637, USA., Lin JF; Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX, 78712, USA.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2022 Aug 17; Vol. 12 (1), pp. 13946. Date of Electronic Publication: 2022 Aug 17.
DOI: 10.1038/s41598-022-18062-6
Abstrakt: Silicate and oxide glasses are often chemically doped with a variety of cations to tune for desirable properties in technological applications, but their performances are often limited by relatively lower mechanical and elastic properties. Finding a new route to synthesize silica-based glasses with high elastic and mechanical properties needs to be explored. Here, we report a dense SiO 2 -glass with ultra-high elastic moduli using sound velocity measurements by Brillouin scattering up to 72 GPa at 300 K. High-temperature measurements were performed up to 63 GPa at 750 K and 59 GPa at 1000 K. Compared to compression at 300 K, elevated temperature helps compressed SiO 2 -glass effectively overcome the kinetic barrier to undergo permanent densification with enhanced coordination number and connectivity. This hot compressed SiO 2 -glass exhibits a substantially high bulk modulus of 361-429 GPa which is at least 2-3 times greater than the metallic, oxide, and silicate glasses at ambient conditions. Its Poisson's ratio, an indicator for the packing efficiency, is comparable to the metallic glasses. Even after temperature quench and decompression to ambient conditions, the SiO 2 -glass retains some of its unique properties at compression and possesses a Poisson's ratio of 0.248(11). In addition to chemical alternatives in glass syntheses, coupled compression and heating treatments can be an effective means to enhance mechanical and elastic properties in high-performance glasses.
(© 2022. The Author(s).)
Databáze: MEDLINE
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