Stable magnesium peroxide at high pressure.

Scientific reports (2015-09-02)
Sergey S Lobanov, Qiang Zhu, Nicholas Holtgrewe, Clemens Prescher, Vitali B Prakapenka, Artem R Oganov, Alexander F Goncharov
摘要

Rocky planets are thought to comprise compounds of Mg and O as these are among the most abundant elements, but knowledge of their stable phases may be incomplete. MgO is known to be remarkably stable to very high pressure and chemically inert under reduced condition of the Earth's lower mantle. However, in exoplanets oxygen may be a more abundant constituent. Here, using synchrotron x-ray diffraction in laser-heated diamond anvil cells, we show that MgO and oxygen react at pressures above 96 GPa and T = 2150 K with the formation of I4/mcm MgO2. Raman spectroscopy detects the presence of a peroxide ion (O2(2-)) in the synthesized material as well as in the recovered specimen. Likewise, energy-dispersive x-ray spectroscopy confirms that the recovered sample has higher oxygen content than pure MgO. Our finding suggests that MgO2 may be present together or instead of MgO in rocky mantles and rocky planetary cores under highly oxidized conditions.

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氧化镁, ≥99.99% trace metals basis
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氧化镁, nanopowder, ≤50 nm particle size (BET)
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氧化镁, 99.99% trace metals basis
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铼, powder, 99.995% trace metals basis
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氧化镁, (single crystal substrate), ≥99.9% trace metals basis, <100>, L × W × thickness 10 mm × 10 mm × 0.5 mm
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铼, foil, thickness 0.25 mm, 99.98% trace metals basis
铼, wire reel, 0.025m, diameter 1.0mm, annealed, 99.97%
铼, wire reel, 0.05m, diameter 0.5mm, annealed, 99.97%
铼, wire reel, 0.05m, diameter 1.0mm, annealed, 99.97%
铼, wire reel, 0.1m, diameter 0.076mm, annealed, 99.97%
铼, wire reel, 0.1m, diameter 0.10mm, annealed, 99.97%
铼, wire reel, 0.1m, diameter 0.125mm, annealed, 99.97%
铼, wire reel, 0.1m, diameter 0.15mm, annealed, 99.97%
铼, wire reel, 0.1m, diameter 0.178mm, annealed, 99.97%
铼, wire reel, 0.1m, diameter 0.25mm, annealed, 99.97%
铼, wire reel, 0.1m, diameter 0.2mm, annealed, 99.97%
铼, wire reel, 0.1m, diameter 0.3mm, annealed, 99.97%
铼, wire reel, 0.1m, diameter 0.5mm, annealed, 99.97%
铼, wire reel, 0.2m, diameter 0.125mm, annealed, 99.97%
铼, wire reel, 0.2m, diameter 0.15mm, annealed, 99.97%
铼, wire reel, 0.2m, diameter 0.178mm, annealed, 99.97%
铼, wire reel, 0.2m, diameter 0.25mm, annealed, 99.97%
铼, wire reel, 0.2m, diameter 0.2mm, annealed, 99.97%
铼, wire reel, 0.2m, diameter 0.3mm, annealed, 99.97%
铼, wire reel, 0.2m, diameter 0.5mm, annealed, 99.97%
铼, wire reel, 0.2m, diameter 1.0mm, annealed, 99.97%
铼, wire reel, 0.5m, diameter 0.076mm, annealed, 99.97%
铼, wire reel, 0.5m, diameter 0.10mm, annealed, 99.97%
铼, wire reel, 0.5m, diameter 0.125mm, annealed, 99.97%
铼, wire reel, 0.5m, diameter 0.15mm, annealed, 99.97%