Stable magnesium peroxide at high pressure

Scientific Reports
Sergey S LobanovAlexander F Goncharov

Abstract

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.

References

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Citations

May 24, 2016·Scientific Reports·Weiwei ZhangAlexander F Goncharov
Apr 12, 2017·Inorganic Chemistry·Shoutao ZhangGuochun Yang
Jun 10, 2017·Inorganic Chemistry·Yanchao WangYanming Ma
Nov 28, 2017·Journal of Physics. Condensed Matter : an Institute of Physics Journal·L RullikE Lundgren
May 12, 2015·Nature Communications·Yan-Ling LiTimothy A Strobel
May 12, 2020·Physical Chemistry Chemical Physics : PCCP·Xin DuGuochun Yang
Apr 23, 2019·Geophysical Research Letters·E BoulardG Fiquet
Nov 23, 2016·Reports on Progress in Physics·Guoyin Shen, Ho Kwang Mao
Mar 31, 2021·Physical Review Letters·E KoemetsL Dubrovinsky
Dec 18, 2018·Inorganic Chemistry·Sheng-Cai ZhuQiang Zhu

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Methods Mentioned

BETA
x-ray spectroscopy

Software Mentioned

VESTA
EoSFit7GUI
DIOPTAS
VASP
Phonopy
Rax
Dicvol06

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