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Title: Phase transition and equation of state of dense hydrous silica up to 63 GPa

Abstract

Although it has previously been considered to be essentially anhydrous, Al-free stishovite can contain up to ~1.3 wt % of H 2O, perhaps through the direct substitution (Si 4+ → 4H +), according to recent studies. Yet the stability of such substitution and its impact on the properties of silica and rutile-structured hydrous phases (such as $δ$-AlOOH and phase H) are unknown at the conditions of the deeper mantle. We have synthesized hydrous and anhydrous Al-free stishovite samples at 723 K and 9 GPa, and 1473 K and 10 GPa, respectively. Synchrotron X-ray diffraction patterns show that the unit cell volume of hydrous stishovite is 1.3% greater than that of anhydrous stishovite at 1 bar, suggesting significant incorporation of OH in the crystal structure (3.2 ± 0.5 wt % H 2O). At 300 K, we found a lower and broader transition pressure from rutile type to CaCl 2 type (28–42 GPa) in hydrous dense silica. We also found that hydrous silica polymorphs are more compressible than their anhydrous counterparts. After the phase transition, the unit cell volume of hydrous silica becomes the same as that of anhydrous silica, showing that the proton incorporation through a direct substitution can be furthermore » stabilized at high pressure. The lower pressure transition and the pressure stabilization of the proton incorporation in silica would provide ways to transport and store water in the lower mantle in silica-rich heterogeneities, such as subducted oceanic crust.« less

Authors:
 [1];  [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [1]
  1. Arizona State Univ., Tempe, AZ (United States)
  2. Univ. of Chicago, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
National Aeronautic and Space Administration (NASA); National Science Foundation (NSF); USDOE
OSTI Identifier:
1409086
Alternate Identifier(s):
OSTI ID: 1389093
Grant/Contract Number:  
FG02-94ER14466; AC02-06CH11357; NSFEAR-11-57758; NSFEAR-1128799; DOEDE-FG02-94ER14466
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Solid Earth
Additional Journal Information:
Journal Volume: 122; Journal Issue: 9; Journal ID: ISSN 2169-9313
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
ENGLISH
Subject:
58 GEOSCIENCES; hydrous stishovite; phase transition; equation of state; direct proton substitution; water in the lower mantle

Citation Formats

Nisr, C., Leinenweber, K., Prakapenka, V., Prescher, C., Tkachev, S., and Shim, S. -H. Dan. Phase transition and equation of state of dense hydrous silica up to 63 GPa. United States: N. p., 2017. Web. doi:10.1002/2017JB014055.
Nisr, C., Leinenweber, K., Prakapenka, V., Prescher, C., Tkachev, S., & Shim, S. -H. Dan. Phase transition and equation of state of dense hydrous silica up to 63 GPa. United States. doi:10.1002/2017JB014055.
Nisr, C., Leinenweber, K., Prakapenka, V., Prescher, C., Tkachev, S., and Shim, S. -H. Dan. Tue . "Phase transition and equation of state of dense hydrous silica up to 63 GPa". United States. doi:10.1002/2017JB014055. https://www.osti.gov/servlets/purl/1409086.
@article{osti_1409086,
title = {Phase transition and equation of state of dense hydrous silica up to 63 GPa},
author = {Nisr, C. and Leinenweber, K. and Prakapenka, V. and Prescher, C. and Tkachev, S. and Shim, S. -H. Dan},
abstractNote = {Although it has previously been considered to be essentially anhydrous, Al-free stishovite can contain up to ~1.3 wt % of H2O, perhaps through the direct substitution (Si4+ → 4H+), according to recent studies. Yet the stability of such substitution and its impact on the properties of silica and rutile-structured hydrous phases (such as $δ$-AlOOH and phase H) are unknown at the conditions of the deeper mantle. We have synthesized hydrous and anhydrous Al-free stishovite samples at 723 K and 9 GPa, and 1473 K and 10 GPa, respectively. Synchrotron X-ray diffraction patterns show that the unit cell volume of hydrous stishovite is 1.3% greater than that of anhydrous stishovite at 1 bar, suggesting significant incorporation of OH in the crystal structure (3.2 ± 0.5 wt % H2O). At 300 K, we found a lower and broader transition pressure from rutile type to CaCl2 type (28–42 GPa) in hydrous dense silica. We also found that hydrous silica polymorphs are more compressible than their anhydrous counterparts. After the phase transition, the unit cell volume of hydrous silica becomes the same as that of anhydrous silica, showing that the proton incorporation through a direct substitution can be further stabilized at high pressure. The lower pressure transition and the pressure stabilization of the proton incorporation in silica would provide ways to transport and store water in the lower mantle in silica-rich heterogeneities, such as subducted oceanic crust.},
doi = {10.1002/2017JB014055},
journal = {Journal of Geophysical Research. Solid Earth},
number = 9,
volume = 122,
place = {United States},
year = {2017},
month = {8}
}

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