Pressure-stabilized divalent ozonide CaO3 and its impact on Earth’s oxygen cycles

Yanchao Wang, Meiling Xu, Liuxiang Yang, Bingmin Yan, Qin Qin, Xuecheng Shao, Yunwei Zhang, Dajian Huang, Xiaohuan Lin, Jian Lv, Dongzhou Zhang, Huiyang Gou (), Ho-kwang Mao, Changfeng Chen () and Yanming Ma ()
Additional contact information
Yanchao Wang: Jilin University
Meiling Xu: Jiangsu Normal University
Liuxiang Yang: Center for High Pressure Science and Technology Advanced Research
Bingmin Yan: Center for High Pressure Science and Technology Advanced Research
Qin Qin: Center for High Pressure Science and Technology Advanced Research
Xuecheng Shao: Jilin University
Yunwei Zhang: Jilin University
Dajian Huang: Center for High Pressure Science and Technology Advanced Research
Xiaohuan Lin: Center for High Pressure Science and Technology Advanced Research
Jian Lv: Jilin University
Dongzhou Zhang: University of Hawai’i at Manoa
Huiyang Gou: Center for High Pressure Science and Technology Advanced Research
Ho-kwang Mao: Center for High Pressure Science and Technology Advanced Research
Changfeng Chen: University of Nevada
Yanming Ma: Jilin University

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract High pressure can drastically alter chemical bonding and produce exotic compounds that defy conventional wisdom. Especially significant are compounds pertaining to oxygen cycles inside Earth, which hold key to understanding major geological events that impact the environment essential to life on Earth. Here we report the discovery of pressure-stabilized divalent ozonide CaO3 crystal that exhibits intriguing bonding and oxidation states with profound geological implications. Our computational study identifies a crystalline phase of CaO3 by reaction of CaO and O2 at high pressure and high temperature conditions; ensuing experiments synthesize this rare compound under compression in a diamond anvil cell with laser heating. High-pressure x-ray diffraction data show that CaO3 crystal forms at 35 GPa and persists down to 20 GPa on decompression. Analysis of charge states reveals a formal oxidation state of −2 for ozone anions in CaO3. These findings unravel the ozonide chemistry at high pressure and offer insights for elucidating prominent seismic anomalies and oxygen cycles in Earth’s interior. We further predict multiple reactions producing CaO3 by geologically abundant mineral precursors at various depths in Earth’s mantle.

Date: 2020
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DOI: 10.1038/s41467-020-18541-2

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