Journal
PHYSICAL REVIEW LETTERS
Volume 123, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.235701
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Funding
- National Research Foundation, Korea [2017R1A2A1A17069511]
- Samsung Science and Technology Foundation (SSTF) [BA1401-07]
- U.S. DOE-BES, Division of Materials Sciences and Engineering [DE-FG02-99ER45775]
- DOE-NNSA's Office of Experimental Sciences
- DOE Office of Science [DE-AC02-06CH11357]
- National Research Foundation of Korea [2017R1A2A1A17069511] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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As oxygen may occupy a major volume of oxides, a densification of amorphous oxides under extreme compression is dominated by reorganization of oxygen during compression. X-ray Raman scattering (XRS) spectra for SiO2 glass up to 1.6 Mbar reveal the evolution of heavily contracted oxygen environments characterized by a decrease in average O-O distance and the potential emergence of quadruply coordinated oxygen (oxygen quadcluster). Our results also reveal that the edge energies at the centers of gravity of the XRS features increase linearly with bulk density, yielding the first predictive relationship between the density and partial density of state of oxides above megabar pressures. The extreme densification paths with densified oxygen in amorphous oxides shed light upon the possible existence of stable melts in the planetary interiors.
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