2018
DOI: 10.1073/pnas.1719134115
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Critical vaporization of MgSiO 3

Abstract: SignificanceDuring accretion, giant impacts may partially vaporize planets, with profound consequences for energy and mass transfer between the growing planet and its satellites. We find that giant impacts produce much more supercritical fluid than previously thought, with a much lower liquid–vapor critical temperature. The vapor is depleted in Mg with respect to coexisting liquid and has very different chemical bonding, being dominated by covalent molecules (O2 and SiO) up to the critical point. These molecul… Show more

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Cited by 28 publications
(35 citation statements)
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“…We find O 2 molecules in both feldspar compositions studied here. This was also observed in previous simulations on pure SiO 2 (Green et al, 2018) and MgSiO 3 (Xiao & Stixrude, 2018). These consistent results suggest that there is potential degassing of O 2 from the silicate melt at high temperatures, independently of the composition of the melt.…”
Section: Resultssupporting
confidence: 88%
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“…We find O 2 molecules in both feldspar compositions studied here. This was also observed in previous simulations on pure SiO 2 (Green et al, 2018) and MgSiO 3 (Xiao & Stixrude, 2018). These consistent results suggest that there is potential degassing of O 2 from the silicate melt at high temperatures, independently of the composition of the melt.…”
Section: Resultssupporting
confidence: 88%
“…We find O 2 molecules in both feldspar compositions studied here. This was also observed in previous simulations on pure SiO 2 (Green et al, 2018) and MgSiO 3 (Xiao & Stixrude, 2018). These consistent results…”
Section: O 2 Behaviorsupporting
confidence: 92%
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“…Famously, renormalization group theory applied to critical behavior in the 3D Ising model gives an analytic form for the phase boundaries for the vapor and liquid sides of the vapor dome: ρv=ρc12)(C1xβ+C2xβ+normalΔ+C3x ρl=ρc+12)(C1xβ+C2xβ+normalΔ+C3x with x)(1TTC, β = 0.325, and normalΔ=12 (Hansen & McDonald, 1990; Pathria & Beale, 2011). Recently, this approach has been employed by Xiao and Stixrude (2018) to describe coexistence in MgSiO 3 . The phase boundary estimates from the Maxwell construction and subsequent analytic fit for the 112‐ and 224‐atom cells are shown in Figure 4.…”
Section: Resultsmentioning
confidence: 99%
“…) , = 0.325, and Δ = 1 2 (Hansen & McDonald, 1990;Pathria & Beale, 2011). Recently, this approach has been employed by Xiao and Stixrude (2018) to describe coexistence in MgSiO 3 . The phase boundary estimates from the Maxwell construction and subsequent analytic fit for the 112-and 224-atom cells are shown in Figure 4.…”
Section: Critical Point Estimation and Uncertainty Quantificationmentioning
confidence: 99%