Synthesis and Stability of Lanthanum Superhydrides

Geballe, Zachary M.; Liu, Hanyu; Mishra, Ajay K.; Ahart, Muhtar; Somayazulu, Maddury; Meng, Yue; Baldini, Maria; Hemley, Russell J.

doi:10.1002/anie.201709970

Synthesis and Stability of Lanthanum Superhydrides

Journal Article · 15 December 2017 · Angewandte Chemie (International Edition)

DOI:https://doi.org/10.1002/anie.201709970· OSTI ID:1418052

^[1]; Liu, Hanyu ^[1]; Mishra, Ajay K. ^[2]; Ahart, Muhtar ^[1]; Somayazulu, Maddury ^[1]; Meng, Yue ^[3]; Baldini, Maria ^[1]; Hemley, Russell J. ^[4]

Geophysical Laboratory, Carnegie Institution of Washington, Washington DC 20015 USA
Geophysical Laboratory, Carnegie Institution of Washington, Washington DC 20015 USA; Permanent address: HP&SRPD, Bhabha Atomic Research Center, Mumbai-85 India
HPCAT, Geophysical Laboratory, Carnegie Institution of Washington, Argonne IL 60439 USA
Institute of Materials Science and Department of Civil and Environmental Engineering, The George Washington University, Washington DC 20052 USA

Recent theoretical calculations predict that megabar pressure stabilizes very hydrogen-rich simple compounds having new clathrate-like structures and remarkable electronic properties including room-temperature superconductivity. X-ray diffraction and optical studies demonstrate that superhydrides of lanthanum can be synthesized with La atoms in an fcc lattice at 170 GPa upon heating to about 1000 K. The results match the predicted cubic metallic phase of LaH10 having cages of thirty-two hydrogen atoms surrounding each La atom. Upon decompression, the fcc-based structure undergoes a rhombohedral distortion of the La sublattice. The superhydride phases consist of an atomic hydrogen sublattice with H-H distances of about 1.1 Å, which are close to predictions for solid atomic metallic hydrogen at these pressures. With stability below 200 GPa, the superhydride is thus the closest analogue to solid atomic metallic hydrogen yet to be synthesized and characterized.

Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Energy Frontier Research Centers (EFRC) (United States). Energy Frontier Research in Extreme Environments (EFree)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

OSTI ID:: 1418052

Journal Information:: Angewandte Chemie (International Edition), Vol. 57, Issue 3; ISSN 1433-7851

Publisher:: Wiley

Country of Publication:: United States

Language:: ENGLISH

References (32)

Synchrotron Infrared Measurements of Dense Hydrogen to 360 GPa No authors listed Physical Review Letters https://doi.org/10.1103/PhysRevLett.108.146402		April 2012
Metallic Hydrogen: A High-Temperature Superconductor? No authors listed Physical Review Letters https://doi.org/10.1103/PhysRevLett.21.1748		December 1968
High-Pressure Synthesis and Characterization of Iridium Trihydride No authors listed Physical Review Letters https://doi.org/10.1103/PhysRevLett.111.215503		November 2013
Quantum hydrogen-bond symmetrization in the superconducting hydrogen sulfide system No authors listed Nature https://doi.org/10.1038/nature17175		March 2016
New Iron Hydrides under High Pressure No authors listed Physical Review Letters https://doi.org/10.1103/PhysRevLett.113.265504		December 2014
Pressure-stabilized superconductive yttrium hydrides No authors listed Scientific Reports https://doi.org/10.1038/srep09948		May 2015
Strain/order parameter coupling in the ferroelastic transition in dense SiO2 No authors listed Solid State Communications https://doi.org/10.1016/S0038-1098(00)00099-5		May 2000
Stable high-pressure phases in the H-S system determined by chemically reacting hydrogen and sulfur No authors listed Physical Review B https://doi.org/10.1103/PhysRevB.95.140101		April 2017
X-ray diffraction and equation of state of hydrogen at megabar pressures No authors listed Nature https://doi.org/10.1038/383702a0		October 1996
Synthesis of FeH ₅ : A layered structure with atomic hydrogen slabs No authors listed Science https://doi.org/10.1126/science.aan0961		July 2017
Pressure-Induced Hydrogen-Dominant Metallic State in Aluminum Hydride No authors listed Physical Review Letters https://doi.org/10.1103/PhysRevLett.100.045504		January 2008
Comment on “Observation of the Wigner-Huntington transition to metallic hydrogen” No authors listed Science https://doi.org/10.1126/science.aan2286		August 2017
Novel reentrant high pressure phase transtion in lanthanum No authors listed Physical Review Letters https://doi.org/10.1103/PhysRevLett.70.4087		June 1993
A little bit of lithium does a lot for hydrogen No authors listed Proceedings of the National Academy of Sciences https://doi.org/10.1073/pnas.0908262106		October 2009
Comment on “Observation of the Wigner-Huntington transition to metallic hydrogen” No authors listed Science https://doi.org/10.1126/science.aam9736		August 2017
Potential high- T _c superconducting lanthanum and yttrium hydrides at high pressure No authors listed Proceedings of the National Academy of Sciences https://doi.org/10.1073/pnas.1704505114		June 2017
Hydrogen Dominant Metallic Alloys: High Temperature Superconductors? No authors listed Physical Review Letters https://doi.org/10.1103/PhysRevLett.92.187002		May 2004
The properties of hydrogen and helium under extreme conditions No authors listed Reviews of Modern Physics https://doi.org/10.1103/RevModPhys.84.1607		November 2012
Superconductive sodalite-like clathrate calcium hydride at high pressures No authors listed Proceedings of the National Academy of Sciences https://doi.org/10.1073/pnas.1118168109		April 2012
Approaches for Reducing the Insulator-Metal Transition Pressure in Hydrogen No authors listed Physical Review Letters https://doi.org/10.1103/PhysRevLett.50.1305		April 1983
Conventional superconductivity at 203 kelvin at high pressures in the sulfur hydride system No authors listed Nature https://doi.org/10.1038/nature14964		August 2015
EosFit7-GUI : a new graphical user interface for equation of state calculations, analyses and teaching No authors listed Journal of Applied Crystallography https://doi.org/10.1107/S1600576716008050		June 2016
Pressure-induced metallization of dense (H2S)2H2 with high-Tc superconductivity No authors listed Scientific Reports https://doi.org/10.1038/srep06968		November 2014
Observation of the Wigner-Huntington transition to metallic hydrogen No authors listed Science https://doi.org/10.1126/science.aal1579		January 2017
Compressed sodalite-like MgH ₆ as a potential high-temperature superconductor No authors listed RSC Advances https://doi.org/10.1039/C5RA11459D		January 2015
On the Possibility of a Metallic Modification of Hydrogen No authors listed The Journal of Chemical Physics https://doi.org/10.1063/1.1749590		December 1935
Ultrahigh-pressure transitions in solid hydrogen No authors listed Reviews of Modern Physics https://doi.org/10.1103/RevModPhys.66.671		April 1994
Synthesis of sodium polyhydrides at high pressures No authors listed Nature Communications https://doi.org/10.1038/ncomms12267		July 2016
Crystal structure of the superconducting phase of sulfur hydride No authors listed Nature Physics https://doi.org/10.1038/nphys3760		May 2016
Hydrogen Clathrate Structures in Rare Earth Hydrides at High Pressures: Possible Route to Room-Temperature Superconductivity No authors listed Physical Review Letters https://doi.org/10.1103/PhysRevLett.119.107001		September 2017
Conductive dense hydrogen No authors listed Nature Materials https://doi.org/10.1038/nmat3175		November 2011
Pressure-induced bonding and compound formation in xenon–hydrogen solids No authors listed Nature Chemistry https://doi.org/10.1038/nchem.445		November 2009

Similar Records

Room-temperature superconductivity in boron- and nitrogen-doped lanthanum superhydride

Journal Article · 2021 · Physical Review. B · OSTI ID:1835885

Ge, Yanfeng; Zhang, Fan; Hemley, Russell J.

Synthesis and Stability of Lanthanum Superhydrides

Journal Article · 2017 · Angewandte Chemie · OSTI ID:1416986

Geballe, Zachary M.; Liu, Hanyu; Mishra, Ajay K.; +5 more

Synthesis and Stability of Lanthanum Superhydrides

Journal Article · 2017 · Angewandte Chemie (International Edition) · OSTI ID:1416987

Geballe, Zachary M.; Liu, Hanyu; Mishra, Ajay K.; +5 more

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Synthesis and Stability of Lanthanum Superhydrides

Citation Formats

References (32)

Similar Records

Related Subjects