2018
DOI: 10.1073/pnas.1716748115
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Pressure-induced structural change in MgSiO 3 glass at pressures near the Earth’s core–mantle boundary

Abstract: Knowledge of the structure and properties of silicate magma under extreme pressure plays an important role in understanding the nature and evolution of Earth's deep interior. Here we report the structure of MgSiO glass, considered an analog of silicate melts, up to 111 GPa. The first (r1) and second (r2) neighbor distances in the pair distribution function change rapidly, with r1 increasing and r2 decreasing with pressure. At 53-62 GPa, the observed r1 and r2 distances are similar to the Si-O and Si-Si distanc… Show more

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Cited by 40 publications
(39 citation statements)
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“…The PDFs of molten basalt 12 at ~30 and ~60 GPa possess the same features (maxima and minima) as PDFs of coesite-IV and coesite-V at corresponding pressures. Reported recently 40 , PDFs of MgSiO 3 glass up to about 110 GPa are significantly different from that of molten basalt 12 , suggesting that compressed pure MgSiO 3 glass cannot represent mantle-related liquids. Densities of coesite-IV and coesite-V at a pressure above ∼45 GPa within the uncertainty of measurements coincide with the density of silica glass 10 (Supplementary Fig.…”
Section: Resultsmentioning
confidence: 94%
“…The PDFs of molten basalt 12 at ~30 and ~60 GPa possess the same features (maxima and minima) as PDFs of coesite-IV and coesite-V at corresponding pressures. Reported recently 40 , PDFs of MgSiO 3 glass up to about 110 GPa are significantly different from that of molten basalt 12 , suggesting that compressed pure MgSiO 3 glass cannot represent mantle-related liquids. Densities of coesite-IV and coesite-V at a pressure above ∼45 GPa within the uncertainty of measurements coincide with the density of silica glass 10 (Supplementary Fig.…”
Section: Resultsmentioning
confidence: 94%
“…provided the first evidence of opioid receptors in vivo . In the early 1970s, the receptors were first identified by the use of radio-binding assay [30-32]. In late 1992, two groups independently cloned DOR from the neuroblastoma x glioma cell line NG-108 by using an expression cloning strategy.…”
Section: Opioid Receptors and Endogenous Opioidsmentioning
confidence: 99%
“…The experimental study of liquid MgSiO 3 has been a long-term challenge, as MgSiO 3 melts at extremely high temperatures even at moderate pressures (melting temperature exceeds 4000 K at 40 GPa (14-16)). Therefore, MgSiO 3 glass has been extensively studied as a possible structural analog for the liquid state at high pressures (13,(17)(18)(19). Vibrational spectroscopy identified structural changes (13,(19)(20)(21) which were confirmed by in situ X-ray diffraction (XRD) studies (22,23).…”
Section: Introductionmentioning
confidence: 98%