Ultrahigh pressure structural changes in a 60 mol. % Al2O3–40 mol. % SiO2 glass

Ohira, Itaru; Kono, Yoshio; Shibazaki, Yuki; Kenney‐Benson, Curtis; Masuno, Atsunobu; Shen, G.

doi:10.7185/geochemlet.1913

Cited by 11 publications

(15 citation statements)

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“…We note that during the static compression of aluminosilicate glasses and melts, the [5,6] Al fraction gradually increases over a wide range of pressures (>∼30 GPa). − By contrast, the coordination transformation during permanent densification occurs within only a narrow pressure span of ∼7 GPa (Figures and ). Figure A shows that the [5,6] Al fraction increases with increasing decompression pressure from ∼6% (at 1 atm) to ∼13% (at 6 GPa).…”

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confidence: 89%

Degree of Permanent Densification in Oxide Glasses upon Extreme Compression up to 24 GPa at Room Temperature

Lee

Mun

Kim

et al. 2020

J. Phys. Chem. Lett.

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During the decompression of plastically deformed glasses at room temperature, some aspects of irreversible densification may be preserved. This densification has been primarily attributed to topological changes in glass networks. The changes in short-range structures like cation coordination numbers are often assumed to be relaxed upon decompression. Here the NMR results for aluminosilicate glass upon permanent densification up to 24 GPa reveal noticeable changes in the Al coordination number under pressure conditions as low as ∼6 GPa. A drastic increase in the highly coordinated Al fraction is evident over only a relatively narrow pressure range of up to ∼12 GPa, above which the coordination change becomes negligible up to 24 GPa. In contrast, Si coordination environments do not change, highlighting preferential coordination transformation during deformation. The observed trend in the coordination environment shows a remarkable similarity to the pressure-induced changes in the residual glass density, yielding a predictive relationship between the irreversible densification and the detailed structures under extreme compression. The results open a way to access the nature of plastic deformation in complex glasses at room temperature.

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confidence: 89%

Degree of Permanent Densification in Oxide Glasses upon Extreme Compression up to 24 GPa at Room Temperature

Lee

Mun

Kim

et al. 2020

J. Phys. Chem. Lett.

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“…Benefitting from the broad energy range of the beamline and the large opening access of the PE press, the energy dispersive x-ray diffraction (EDXD) setup at the beamline covers a large momentum transfer (large-Q), allowing for the collection of structure factor data (q) between 1 and 30 Å −1 . A large q coverage is essential for reliable structural information in particular of amorphous materials and melts (Kono et al 2016 , 2020b ; Ohira et al 2019 ; Shu et al 2020b ; Eastmond et al 2021 ). PE press inside the 16-BM-B station and the schematic of the setup is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…The large sample volume not only makes it possible to detect weak scattered signals but also provides needed space for effective collimation to suppress the unwanted background signals from surrounding materials. Recently, the double-stage PE press assembly has been used for measuring structure factors and pair distribution functions of glasses and melts in the Mbar pressure region (Kono et al 2016 , 2020b ; Ohira et al 2019 ; Shu et al 2020b ).…”

Section: Introductionmentioning

confidence: 99%

“…Viscosities of geologically relevant melts have been measured for understanding the dynamics of the Earth’s interior (Kono 2019 ) (Stagno et al 2020 ) and densities of melts provide essential information on the structures of planetary interiors (Deng et al 2019 ; Mouser et al 2021 ). Structures of silicate and oxide glasses have been measured to high pressures at pressures above 100 GPa (Ohira et al 2019 ; Shu et al 2020b ; Kono et al 2020b ; Hu et al 2021 ). High cation coordination is systematically observed in dioxide glasses with increasing pressure, showing plateaus at 4-, 6-, and 9-coordinated networks (Shu et al 2020b ).…”

Section: Introductionmentioning

confidence: 99%

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Overview of HPCAT and capabilities for studying minerals and various other materials at high-pressure conditions

et al. 2022

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High-Pressure Collaborative Access Team (HPCAT) is a synchrotron-based facility located at the Advanced Photon Source (APS). With four online experimental stations and various offline capabilities, HPCAT is focused on providing synchrotron x-ray capabilities for high pressure and temperature research and supporting a broad user community. Overall, the array of online/offline capabilities is described, including some of the recent developments for remote user support and the concomitant impact of the current pandemic. General overview of work done at HPCAT and with a focus on some of the minerals relevant work and supporting capabilities is also discussed. With the impending APS-Upgrade (APS-U), there is a considerable effort within HPCAT to improve and add capabilities. These are summarized briefly for each of the end-stations.

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“…Aluminium Silicate (AS2) glass plays an important role in several geochemical applications, such as low-melting glassy materials, radiation shielding materials, photonics and the electronic industry. As we know, AS2 is another multi-component oxide system with a network-forming structure [1][2][3][4][5][6][7][8][9]. Many experimental techniques such as nuclear magnetic resonance, X-ray scattering, infrared, and Raman spectroscopy [10][11][12][13][14] found evidence for structural units, such as 3-fold coordinated by O atoms and 5-and 6-fold coordinated by Si (Al) atoms that are not found in pure SiO2, unless one considers SiO2 glass at a high-pressure region.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation to Investigate the Effect of Al2O3 Doping and Compression on the Structural Properties of Aluminium Silicate Glass

Kien

Monesaykham

Trang

2022

J. Hum. Earth Future

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In this paper, we have performed molecular dynamics simulation to investigate the effect of Al2O3 doping and compression on the structural properties of aluminium silicate (AS2) glass. The structural properties are examined via TOx units, OTy linkages, the average bond angle distributions, order parameters, and cluster function. The result shows that the network structure of AS2 is mainly built by TOx units and OTy linkages (T = Si or Al, x = 3-7, y = 2-4). We found that in AS2 glass, the subnet structure performed by the perfect SiOx units is not transfigured. Meanwhile, the AlOx units are significantly distorted. The structural organization of the SiO4-network in AS2 glass is not dependent on Al2O3doping. Moreover, the degree of structural homogenous significantly depends on compression. In the range of 15–25 GPa, the structural homogenous of AS2 is caused by the mobility of all atoms, tightly related to the glass-glass transition. Our work is expected to support finding the AS2 compositions that can produce hard and damage-tolerant glasses in the higher pressure region. Doi: 10.28991/HEF-2022-03-02-03 Full Text: PDF

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Ultrahigh pressure structural changes in a 60 mol. % Al2O3–40 mol. % SiO2 glass

Cited by 11 publications

References 11 publications

Degree of Permanent Densification in Oxide Glasses upon Extreme Compression up to 24 GPa at Room Temperature

Degree of Permanent Densification in Oxide Glasses upon Extreme Compression up to 24 GPa at Room Temperature

Overview of HPCAT and capabilities for studying minerals and various other materials at high-pressure conditions

Molecular Dynamics Simulation to Investigate the Effect of Al2O3 Doping and Compression on the Structural Properties of Aluminium Silicate Glass

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