Electronic bandgap of water in the superionic and plasma phases

被引:4
作者
Li, Jiangtao [1 ,2 ]
Shu, Hua [3 ]
Sun, Yi [1 ,2 ]
Zhang, Hang [1 ,2 ]
Yang, Jing [1 ,2 ]
Wu, Qiang [1 ]
Hu, Jianbo [1 ,2 ,4 ]
机构
[1] China Acad Engn Phys, Inst Fluid Phys, Mianyang 621900, Sichuan, Peoples R China
[2] Southwest Univ Sci & Technol, State Key Lab Environm Friendly Energy Mat, Mianyang 621010, Sichuan, Peoples R China
[3] China Acad Engn Phys, Shanghai Inst Laser Plasma, Shanghai 201800, Peoples R China
[4] Sichuan Civil Mil Integrat Inst, Mianyang 621010, Sichuan, Peoples R China
基金
中国国家自然科学基金;
关键词
EQUATION-OF-STATE; ELECTRICAL-CONDUCTIVITY; MAGNETIC-FIELDS; URANUS; AMMONIA; INTERIOR; PRESSURE;
D O I
10.1063/1.5110544
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
Water has been proposed to be one of the main compositions of icy giant planets like Neptune and Uranus. Its thermodynamic states and transport properties at extremes are of interest not only to constrain the interior models but also to understand abnormal magnetic fields of planets. The electronic bandgap of water, which significantly influences the ionization ratio and the conductivity, however, is still under debate. In this work, we revisit the shock reflectivity data reported in the literature. By applying a Drude model, the electronic bandgap of water in the superionic and plasma phases is determined to be 4.4 +/- 0.2eV, in contrast to the threshold of 1.25 +/- 0.04eV for free ion generation in the molecular and ionic fluid phases. Interestingly, the bandgap of water does not show a significant tendency of closure with the increase in pressure or temperature in the investigated regime, and the bandgap value is consistent with the predicted value of 4-6eV by the density functional theory assuming a hybrid Heyd-Scuseria-Ernzerhof functional [Millot et al., Nat. Phys. 14, 297-302 (2018)]. The electronic bandgap and the energy threshold determined in this work provide essential parameters for estimating the conductivity along the radius of Neptune and Uranus and will promote our understanding of the origin of the abnormal magnetic fields.
引用
收藏
页数:5
相关论文
共 43 条
[21]   Formation of diamonds in laser-compressed hydrocarbons at planetary interior conditions [J].
Kraus, D. ;
Vorberger, J. ;
Pak, A. ;
Hartley, N. J. ;
Fletcher, L. B. ;
Frydrych, S. ;
Galtier, E. ;
Gamboa, E. J. ;
Gericke, D. O. ;
Glenzer, S. H. ;
Granados, E. ;
MacDonald, M. J. ;
MacKinnon, A. J. ;
McBride, E. E. ;
Nam, I. ;
Neumayer, P. ;
Roth, M. ;
Saunders, A. M. ;
Schuster, A. K. ;
Sun, P. ;
van Driel, T. ;
Doppner, T. ;
Falcone, R. W. .
NATURE ASTRONOMY, 2017, 1 (09) :606-611
[22]   Laser-driven shock experiments on precompressed water: Implications for "icy" giant planets [J].
Lee, Kanani K. M. ;
Benedetti, L. Robin ;
Jeanloz, Raymond ;
Celliers, Peter M. ;
Eggert, Jon H. ;
Hicks, Damien G. ;
Moon, Stephen J. ;
Mackinnon, Andrew ;
Da Silva, Luis B. ;
Bradley, David K. ;
Unites, Walter ;
Collins, Gilbert W. ;
Henry, Emeric ;
Koenig, Michel ;
Benuzzi-Mounaix, Alessandra ;
Pasley, John ;
Neely, David .
JOURNAL OF CHEMICAL PHYSICS, 2006, 125 (01)
[23]   Modulated phases and proton centring in ice observed by X-ray diffraction up to 170 GPa [J].
Loubeyre, P ;
LeToullec, R ;
Wolanin, E ;
Hanfland, M ;
Husermann, D .
NATURE, 1999, 397 (6719) :503-506
[24]   Phase diagram and electrical conductivity of high energy-density water from density functional theory [J].
Mattsson, Thomas R. ;
Desjarlais, Michael P. .
PHYSICAL REVIEW LETTERS, 2006, 97 (01)
[25]   Experimental evidence for superionic water ice using shock compression [J].
Millot, Marius ;
Hamel, Sebastien ;
Rygg, J. Ryan ;
Celliers, Peter M. ;
Collins, Gilbert W. ;
Coppari, Federica ;
Fratanduono, Dayne E. ;
Jeanloz, Raymond ;
Swift, Damian C. ;
Eggert, Jon H. .
NATURE PHYSICS, 2018, 14 (03) :297-+
[26]   EQUATION OF STATE AND ELECTRICAL-CONDUCTIVITY OF WATER AND AMMONIA SHOCKED TO THE 100 GPA (1 MBAR) PRESSURE RANGE [J].
MITCHELL, AC ;
NELLIS, WJ .
JOURNAL OF CHEMICAL PHYSICS, 1982, 76 (12) :6273-6281
[27]   Equation of state and electrical conductivity of ''synthetic Uranus,'' a mixture of water, ammonia, and isopropanol, at shock pressure up to 200 GPa (2 Mbar) [J].
Nellis, WJ ;
Holmes, NC ;
Mitchell, AC ;
Hamilton, DC ;
Nicol, M .
JOURNAL OF CHEMICAL PHYSICS, 1997, 107 (21) :9096-9100
[28]   THE NATURE OF THE INTERIOR OF URANUS BASED ON STUDIES OF PLANETARY ICES AT HIGH DYNAMIC PRESSURE [J].
NELLIS, WJ ;
HAMILTON, DC ;
HOLMES, NC ;
RADOUSKY, HB ;
REE, FH ;
MITCHELL, AC ;
NICOL, M .
SCIENCE, 1988, 240 (4853) :779-781
[29]   MAGNETIC-FIELDS AT URANUS [J].
NESS, NF ;
ACUNA, MH ;
BEHANNON, KW ;
BURLAGA, LF ;
CONNERNEY, JEP ;
LEPPING, RP ;
NEUBAUER, FM .
SCIENCE, 1986, 233 (4759) :85-89
[30]   MAGNETIC-FIELDS AT NEPTUNE [J].
NESS, NF ;
ACUNA, MH ;
BURLAGA, LF ;
CONNERNEY, JEP ;
LEPPING, RP ;
NEUBAUER, FM .
SCIENCE, 1989, 246 (4936) :1473-1478