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Title: Volumetric properties of magnesium silicate glasses and supercooled liquid at high pressure by X-ray microtomography

Abstract

The volumetric properties of silicate glasses and supercooled liquid are examined at high pressures and temperatures using X-ray computed tomography (CT) and absorption. The high pressure X-ray microtomography (HPXMT) system at the Advanced Photon Source, Argonne National Laboratory (GeoSoilEnvironCARS 13-BM-D beamline) consists of two opposing anvils compressed within an X-ray-transparent containment ring supported by thrust bearings and loaded using a 250-ton hydraulic press. This system permits the pressure cell to rotate under the load, while collecting radiographs through at least 180{sup o} of rotation. The 13-BM-D beamline permits convenient switching between monochromatic radiation required for radiography and polychromatic radiation for pressure determination by energy dispersive diffraction. We report initial results on several refractory magnesium silicate glasses synthesized by levitation laser heating. Volume changes during room temperature compression of Mg-silicate glasses with 33 mol% and 38 mol% SiO2 up to 11.5 GPa give an isothermal bulk moduli of 93--100 GPa for a K' of 1. These values are consistent with ultrasonic measurements of more silica-rich glasses. The volumetric properties of amorphous MgSiO{sub 3} at 2 GPa were examined during annealing up to 1000 C. We consider the consequences of heating through the glass transition and the implications for thermal expansivity ofmore » supercooled liquids at high pressure. Our results illustrate the capabilities of HPXMT for studies of refractory glasses and liquids at high pressure and offer strategies for future studies of liquid densities within the melting interval for magmas in planet interiors.« less

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1005619
Resource Type:
Journal Article
Journal Name:
Phys. Earth Planet. In.
Additional Journal Information:
Journal Volume: 174; Journal Issue: (1-4) ; 05, 2009; Journal ID: ISSN 0031-9201
Country of Publication:
United States
Language:
ENGLISH
Subject:
58 GEOSCIENCES; 36 MATERIALS SCIENCE; MAGNESIUM SILICATES; GLASS; COMPUTERIZED TOMOGRAPHY; PRESSURE RANGE GIGA PA; TEMPERATURE RANGE 1000-4000 K; MAGMA; PLANETS

Citation Formats

Lesher, Charles E, Wang, Yanbin, Gaudio, Sarah, Clark, Alisha, Nishiyama, Nori, Rivers, Mark, UCD), and UC). Volumetric properties of magnesium silicate glasses and supercooled liquid at high pressure by X-ray microtomography. United States: N. p., 2009. Web. doi:10.1016/j.pepi.2008.10.023.
Lesher, Charles E, Wang, Yanbin, Gaudio, Sarah, Clark, Alisha, Nishiyama, Nori, Rivers, Mark, UCD), & UC). Volumetric properties of magnesium silicate glasses and supercooled liquid at high pressure by X-ray microtomography. United States. https://doi.org/10.1016/j.pepi.2008.10.023
Lesher, Charles E, Wang, Yanbin, Gaudio, Sarah, Clark, Alisha, Nishiyama, Nori, Rivers, Mark, UCD), and UC). 2009. "Volumetric properties of magnesium silicate glasses and supercooled liquid at high pressure by X-ray microtomography". United States. https://doi.org/10.1016/j.pepi.2008.10.023.
@article{osti_1005619,
title = {Volumetric properties of magnesium silicate glasses and supercooled liquid at high pressure by X-ray microtomography},
author = {Lesher, Charles E and Wang, Yanbin and Gaudio, Sarah and Clark, Alisha and Nishiyama, Nori and Rivers, Mark and UCD) and UC)},
abstractNote = {The volumetric properties of silicate glasses and supercooled liquid are examined at high pressures and temperatures using X-ray computed tomography (CT) and absorption. The high pressure X-ray microtomography (HPXMT) system at the Advanced Photon Source, Argonne National Laboratory (GeoSoilEnvironCARS 13-BM-D beamline) consists of two opposing anvils compressed within an X-ray-transparent containment ring supported by thrust bearings and loaded using a 250-ton hydraulic press. This system permits the pressure cell to rotate under the load, while collecting radiographs through at least 180{sup o} of rotation. The 13-BM-D beamline permits convenient switching between monochromatic radiation required for radiography and polychromatic radiation for pressure determination by energy dispersive diffraction. We report initial results on several refractory magnesium silicate glasses synthesized by levitation laser heating. Volume changes during room temperature compression of Mg-silicate glasses with 33 mol% and 38 mol% SiO2 up to 11.5 GPa give an isothermal bulk moduli of 93--100 GPa for a K' of 1. These values are consistent with ultrasonic measurements of more silica-rich glasses. The volumetric properties of amorphous MgSiO{sub 3} at 2 GPa were examined during annealing up to 1000 C. We consider the consequences of heating through the glass transition and the implications for thermal expansivity of supercooled liquids at high pressure. Our results illustrate the capabilities of HPXMT for studies of refractory glasses and liquids at high pressure and offer strategies for future studies of liquid densities within the melting interval for magmas in planet interiors.},
doi = {10.1016/j.pepi.2008.10.023},
url = {https://www.osti.gov/biblio/1005619}, journal = {Phys. Earth Planet. In.},
issn = {0031-9201},
number = (1-4) ; 05, 2009,
volume = 174,
place = {United States},
year = {2009},
month = {6}
}