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Kobayashi K, Okumura M, Nakamura H, Itakura M, Machida M, Urata S, Suzuya K. Machine learning molecular dynamics reveals the structural origin of the first sharp diffraction peak in high-density silica glasses. Sci Rep 2023; 13:18721. [PMID: 37973977 PMCID: PMC10654503 DOI: 10.1038/s41598-023-44732-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Accepted: 10/11/2023] [Indexed: 11/19/2023] Open
Abstract
The first sharp diffraction peak (FSDP) in the total structure factor has long been regarded as a characteristic feature of medium-range order (MRO) in amorphous materials with a polyhedron network, and its underlying structural origin is a subject of ongoing debate. In this study, we utilized machine learning molecular dynamics (MLMD) simulations to explore the origin of FSDP in two typical high-density silica glasses: silica glass under pressure and permanently densified glass. Our MLMD simulations accurately reproduce the structural properties of high-density silica glasses observed in experiments, including changes in the FSDP intensity depending on the compression temperature. By analyzing the simulated silica glass structures, we uncover the structural origin responsible for the changes in the MRO at high density in terms of the periodicity between the ring centers and the shape of the rings. The reduction or enhancement of MRO in the high-density silica glasses can be attributed to how the rings deform under compression.
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Affiliation(s)
- Keita Kobayashi
- CCSE, Japan Atomic Energy Agency, Kashiwa, Chiba, 277-0871, Japan.
| | - Masahiko Okumura
- CCSE, Japan Atomic Energy Agency, Kashiwa, Chiba, 277-0871, Japan
| | - Hiroki Nakamura
- CCSE, Japan Atomic Energy Agency, Kashiwa, Chiba, 277-0871, Japan
| | | | - Masahiko Machida
- CCSE, Japan Atomic Energy Agency, Kashiwa, Chiba, 277-0871, Japan
| | - Shingo Urata
- Innovative Technology Research Center, AGC Inc., 1150 Hazawa-cho, Kanagawa-ku, Yokohama, Kanagawa, 221-8755, Japan
| | - Kentaro Suzuya
- Materials and Life Science Division, J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195, Japan
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Danilov I, Gromnitskaya E, Brazhkin V. Thermobaric history as a tool to govern properties of glasses: case of dipropylene glycol. Phys Chem Chem Phys 2023; 25:26813-26819. [PMID: 37782054 DOI: 10.1039/d3cp03306f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/03/2023]
Abstract
The elastic properties of high- and low-pressure glasses of dipropylene glycol were determined for the first time under conditions of isothermal compression up to 1 GPa at 77 K and isobaric heating of 77-300 K at 0.05 GPa and 1 GPa. A strong dependence of the elastic properties of glasses on their thermobaric history has been revealed: glasses obtained at high pressure have not only higher densities (3.9%), but also noticeably higher elastic moduli. This effect is especially pronounced in the shear modulus: high-pressure glass has a 30% higher shear modulus than low-pressure glass. The behavior of elastic moduli during the glass-to-liquid transition also depends on the thermobaric history. Glass produced at low pressure but heated at high pressure has anomalous temperature dependences of the elastic moduli. Heating dipropylene glycol glasses at different pressures allowed us to refine the Tg(P) dependence.
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Affiliation(s)
- Igor Danilov
- Institute for High Pressure Physics, Russian Academy of Sciences, 14, Kaluzhskoe shosse, 108840, Troitsk, Moscow, Russia.
| | - Elena Gromnitskaya
- Institute for High Pressure Physics, Russian Academy of Sciences, 14, Kaluzhskoe shosse, 108840, Troitsk, Moscow, Russia.
| | - Vadim Brazhkin
- Institute for High Pressure Physics, Russian Academy of Sciences, 14, Kaluzhskoe shosse, 108840, Troitsk, Moscow, Russia.
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Kirchner KA, Cassar DR, Zanotto ED, Ono M, Kim SH, Doss K, Bødker ML, Smedskjaer MM, Kohara S, Tang L, Bauchy M, Wilkinson CJ, Yang Y, Welch RS, Mancini M, Mauro JC. Beyond the Average: Spatial and Temporal Fluctuations in Oxide Glass-Forming Systems. Chem Rev 2022; 123:1774-1840. [PMID: 35511603 DOI: 10.1021/acs.chemrev.1c00974] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Atomic structure dictates the performance of all materials systems; the characteristic of disordered materials is the significance of spatial and temporal fluctuations on composition-structure-property-performance relationships. Glass has a disordered atomic arrangement, which induces localized distributions in physical properties that are conventionally defined by average values. Quantifying these statistical distributions (including variances, fluctuations, and heterogeneities) is necessary to describe the complexity of glass-forming systems. Only recently have rigorous theories been developed to predict heterogeneities to manipulate and optimize glass properties. This article provides a comprehensive review of experimental, computational, and theoretical approaches to characterize and demonstrate the effects of short-, medium-, and long-range statistical fluctuations on physical properties (e.g., thermodynamic, kinetic, mechanical, and optical) and processes (e.g., relaxation, crystallization, and phase separation), focusing primarily on commercially relevant oxide glasses. Rigorous investigations of fluctuations enable researchers to improve the fundamental understanding of the chemistry and physics governing glass-forming systems and optimize structure-property-performance relationships for next-generation technological applications of glass, including damage-resistant electronic displays, safer pharmaceutical vials to store and transport vaccines, and lower-attenuation fiber optics. We invite the reader to join us in exploring what can be discovered by going beyond the average.
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Affiliation(s)
- Katelyn A Kirchner
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Daniel R Cassar
- Department of Materials Engineering, Federal University of São Carlos, São Carlos, Sao Paulo 13565-905, Brazil
- Ilum School of Science, Brazilian Center for Research in Energy and Materials, Campinas, Sao Paulo 13083-970, Brazil
| | - Edgar D Zanotto
- Department of Materials Engineering, Federal University of São Carlos, São Carlos, Sao Paulo 13565-905, Brazil
| | - Madoka Ono
- Research Institute for Electronic Science, Hokkaido University, Sapporo, Hokkaido 001-0021, Japan
- Materials Integration Laboratories, AGC Incorporated, Yokohama, Kanagawa 230-0045, Japan
| | - Seong H Kim
- Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Karan Doss
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Mikkel L Bødker
- Department of Chemistry and Bioscience, Aalborg University, Aalborg 9220, Denmark
| | - Morten M Smedskjaer
- Department of Chemistry and Bioscience, Aalborg University, Aalborg 9220, Denmark
| | - Shinji Kohara
- Research Center for Advanced Measurement and Characterization National Institute for Materials Science, 1-2-1, Sengen, Tsukuba, Ibaraki 305-0047, Japan
| | - Longwen Tang
- Department of Civil and Environmental Engineering, University of California, Los Angeles, California 90095, United States
| | - Mathieu Bauchy
- Department of Civil and Environmental Engineering, University of California, Los Angeles, California 90095, United States
| | - Collin J Wilkinson
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Department of Research and Development, GlassWRX, Beaufort, South Carolina 29906, United States
| | - Yongjian Yang
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Rebecca S Welch
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Matthew Mancini
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - John C Mauro
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
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Ono M, Aoyama S, Fujinami M, Ito S. Significant suppression of Rayleigh scattering loss in silica glass formed by the compression of its melted phase. OPTICS EXPRESS 2018; 26:7942-7948. [PMID: 29715768 DOI: 10.1364/oe.26.007942] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Accepted: 03/11/2018] [Indexed: 06/08/2023]
Abstract
We propose the formation of silica glass with improved optical transport properties by compressing its melted phase with a hot isostatic pressure machine at high pressure and temperature. The lowest Rayleigh scattering loss was obtained for the glass held at 200 MPa and 2073 K for 4 h. The observed loss corresponds to 0.07 dB/Km at 1.55 μm, which is about half of the loss in conventional silica glass fiber. The decrease in the loss was well explained in terms of the decrease in the size of the sub-nanometer-sized structural voids observed by positron annihilation lifetime spectroscopy in silica glass. The achievement of high transparency and strong confinement of light represents a promising result for the development of future fiber-core media.
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