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Title: Amorphous boron oxide at megabar pressures via inelastic X-ray scattering

Abstract

Structural transition in amorphous oxides, including glasses, under extreme compression above megabar pressures (>1 million atmospheric pressure, 100 GPa) results in unique densification paths that differ from those in crystals. Experimentally verifying the atomistic origins of such densifications beyond 100 GPa remains unknown. Progress in inelastic X-ray scattering (IXS) provided insights into the pressure-induced bonding changes in oxide glasses; however, IXS has a signal intensity several orders of magnitude smaller than that of elastic X-rays, posing challenges for probing glass structures above 100 GPa near the Earth’s core–mantle boundary. Here, we report megabar IXS spectra for prototypical B 2 O 3 glasses at high pressure up to ∼120 GPa, where it is found that only four-coordinated boron ( [4] B) is prevalent. The reduction in the [4] B–O length up to 120 GPa is minor, indicating the extended stability of sp 3 -bonded [4] B. In contrast, a substantial decrease in the average O–O distance upon compression is revealed, suggesting that the densification in B 2 O 3 glasses is primarily due to O–O distance reduction without the formation of [5] B. Together with earlier results with other archetypal oxide glasses, such as SiO 2 and GeO 2 , themore » current results confirm that the transition pressure of the formation of highly coordinated framework cations systematically increases with the decreasing atomic radius of the cations. These observations highlight a new opportunity to study the structure of oxide glass above megabar pressures, yielding the atomistic origins of densification in melts at the Earth’s core–mantle boundary.« less

Authors:
ORCiD logo; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Samsung Science and Technology Foundation; National Research Foundation of Korea (NRF); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1438080
Alternate Identifier(s):
OSTI ID: 1459011
Grant/Contract Number:  
AC02-06CH11357; FG02-99ER45775; BA1401-07; 2017R1A2A1A17069511; NA0001974
Resource Type:
Journal Article: Published Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Volume: 115 Journal Issue: 23; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; amorphous boron oxide; extreme compression; megabar pressures; inelastic X-ray scattering

Citation Formats

Lee, Sung Keun, Kim, Yong-Hyun, Chow, Paul, Xiao, Yunming, Ji, Cheng, and Shen, Guoyin. Amorphous boron oxide at megabar pressures via inelastic X-ray scattering. United States: N. p., 2018. Web. doi:10.1073/pnas.1800777115.
Lee, Sung Keun, Kim, Yong-Hyun, Chow, Paul, Xiao, Yunming, Ji, Cheng, & Shen, Guoyin. Amorphous boron oxide at megabar pressures via inelastic X-ray scattering. United States. doi:10.1073/pnas.1800777115.
Lee, Sung Keun, Kim, Yong-Hyun, Chow, Paul, Xiao, Yunming, Ji, Cheng, and Shen, Guoyin. Mon . "Amorphous boron oxide at megabar pressures via inelastic X-ray scattering". United States. doi:10.1073/pnas.1800777115.
@article{osti_1438080,
title = {Amorphous boron oxide at megabar pressures via inelastic X-ray scattering},
author = {Lee, Sung Keun and Kim, Yong-Hyun and Chow, Paul and Xiao, Yunming and Ji, Cheng and Shen, Guoyin},
abstractNote = {Structural transition in amorphous oxides, including glasses, under extreme compression above megabar pressures (>1 million atmospheric pressure, 100 GPa) results in unique densification paths that differ from those in crystals. Experimentally verifying the atomistic origins of such densifications beyond 100 GPa remains unknown. Progress in inelastic X-ray scattering (IXS) provided insights into the pressure-induced bonding changes in oxide glasses; however, IXS has a signal intensity several orders of magnitude smaller than that of elastic X-rays, posing challenges for probing glass structures above 100 GPa near the Earth’s core–mantle boundary. Here, we report megabar IXS spectra for prototypical B 2 O 3 glasses at high pressure up to ∼120 GPa, where it is found that only four-coordinated boron ( [4] B) is prevalent. The reduction in the [4] B–O length up to 120 GPa is minor, indicating the extended stability of sp 3 -bonded [4] B. In contrast, a substantial decrease in the average O–O distance upon compression is revealed, suggesting that the densification in B 2 O 3 glasses is primarily due to O–O distance reduction without the formation of [5] B. Together with earlier results with other archetypal oxide glasses, such as SiO 2 and GeO 2 , the current results confirm that the transition pressure of the formation of highly coordinated framework cations systematically increases with the decreasing atomic radius of the cations. These observations highlight a new opportunity to study the structure of oxide glass above megabar pressures, yielding the atomistic origins of densification in melts at the Earth’s core–mantle boundary.},
doi = {10.1073/pnas.1800777115},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
issn = {0027-8424},
number = 23,
volume = 115,
place = {United States},
year = {2018},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1073/pnas.1800777115

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