首页|Distinct vibrational signatures and complex phase behavior in metallic oxygen

Distinct vibrational signatures and complex phase behavior in metallic oxygen

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Evidence for metallization in dense oxygen has been reported for over 30 years[Desgreniers et al.,J.Phys.Chem.94,1117(1990)]at a now routinely accessible 95 GPa[Shimizu et al.,Nature 393,767(1998)].However,despite the longevity of this result and the technological advances since,the nature of the metallic phase remains poorly constrained[Akahama et al.,Phys.Rev.Lett.74,4690(1995);Goncharov et al.,Phys.Rev.B 68,224108(2003);Ma,Phys.Rev.B 76,064101(2007);and Weck et al.,Phys.Rev.Lett.102,255503(2009)].In this work,through Raman spectroscopy,we report the distinct vibrational characteristics of metallic ζ-O2 from 85 to 225 GPa.In comparison with numerical simulations,we find reasonable agreement with the C2/m candidate structure up to about 150 GPa.At higher pressures,the C2/m structure is found to be unstable and incompatible with experimental observations.Alternative candidate structures,C2/c and Ci,with only two molecules in the primitive unit cell,are found to be stable and more compatible with measurements above 175 GPa,indicative of the dissociation of(O2)4 units.Further,we report and discuss a strong hysteresis and metastability with the precursory phase ε-O2.These findings will reinvigorate experimental and theoretical work into the dense oxygen system,which will have importance for oxygen-bearing chemistry,prevalent in the deep Earth,as well as fundamental physics.

Philip Dalladay-Simpson、Bartomeu Monserrat、Li Zhang、Federico Gorelli

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Center for High Pressure Science Technology Advanced Research,1690 Cailun Road,Shanghai 201203,China

Department of Materials Science and Metallurgy,University of Cambridge,27 Charles Babbage Road,Cambridge CB3 OFS,United Kingdom

Cavendish Laboratory,University of Cambridge,J.J.Thomson Avenue,Cambridge CB3 OHE,United Kingdom

Istituto Nazionale di Ottica,Consiglio Nazionale delle Ricerche(CNR-INO),50125 Florence,Italy

Shanghai Advanced Research in Physical Sciences(SHARPS),Shanghai,China

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UKRI Future Leaders FellowshipGianna Angelopoulos Programme for Science,Technology,and InnovationWinton Programme for the Physics of Sustainability上海市科委项目Shanghai Key Laboratory of Novel Extreme Condition Materials,Chinabeamline ID27 at the European Synchrotron Radiation Facility(ESRF),Grenoble,Francebeamline ID27 at the European Synchrotron Radiation Facility(ESRF),Grenoble,Francepreliminary investigations on beamline 15U1 at the Shanghai Synchrotron Radiation Facility(SSRF),ShanghaiUK EPSRC

MR/V023926/122JC141030022dz2260800CH6636CH6300EP/P020259/1

2024

10.1063/5.0160060

极端条件下的物质与辐射(英文)
中国工程物理研究院科技信息中心

极端条件下的物质与辐射(英文)

ISSN：2468-2047
年,卷(期)：2024.9(2)
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