1
|
Shuttleworth H, Osmond I, Strain C, Binns J, Buhot J, Friedemann S, Howie RT, Gregoryanz E, Peña-Alvarez M. Pressure-Induced Metallization of BaH 2 and the Effect of Hydrogenation. J Phys Chem Lett 2023; 14:11490-11496. [PMID: 38085985 PMCID: PMC10749470 DOI: 10.1021/acs.jpclett.3c02704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Revised: 11/06/2023] [Accepted: 11/10/2023] [Indexed: 12/22/2023]
Abstract
Using optical spectroscopy, X-ray diffraction, and electrical transport measurements, we have studied the pressure-induced metallization in BaH2 and Ba8H46. Our combined measurements suggest a structural phase transition from BaH2-II to BaH2-III accompanied by band gap closure and transformation to a metallic state at 57 GPa. The metallization is confirmed by resistance measurements as a function of the pressure and temperature. We also confirm that, with further hydrogenation, BaH2 forms the previously observed Weaire-Phelan Ba8H46, synthesized at 45 GPa and 1200 K. In this compound, metallization pressure is shifted to 85 GPa. Through a comparison of the properties of these two compounds, a question is raised about the importance of the hydrogen content in the electronic properties of hydride systems.
Collapse
Affiliation(s)
- Hannah
A. Shuttleworth
- Centre
for Science at Extreme Conditions, The University
of Edinburgh, Edinburgh EH8 8AQ, United
Kingdom
| | - Israel Osmond
- Centre
for Science at Extreme Conditions, The University
of Edinburgh, Edinburgh EH8 8AQ, United
Kingdom
| | - Calum Strain
- Centre
for Science at Extreme Conditions, The University
of Edinburgh, Edinburgh EH8 8AQ, United
Kingdom
| | - Jack Binns
- Center
for High Pressure Science and Technology Advanced Research, 1690 Cailun Road, Shanghai 201203, People’s Republic of China
| | - Jonathan Buhot
- H.H.
Wills Physics Laboratory, University of
Bristol, Bristol BS8 1TL, United
Kingdom
| | - Sven Friedemann
- H.H.
Wills Physics Laboratory, University of
Bristol, Bristol BS8 1TL, United
Kingdom
| | - Ross T. Howie
- Centre
for Science at Extreme Conditions, The University
of Edinburgh, Edinburgh EH8 8AQ, United
Kingdom
- Center
for High Pressure Science and Technology Advanced Research, 1690 Cailun Road, Shanghai 201203, People’s Republic of China
| | - Eugene Gregoryanz
- Centre
for Science at Extreme Conditions, The University
of Edinburgh, Edinburgh EH8 8AQ, United
Kingdom
- Center
for High Pressure Science and Technology Advanced Research, 1690 Cailun Road, Shanghai 201203, People’s Republic of China
- Key
Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences (CAS), Hefei, Anhui 230031, People’s Republic of China
| | - Miriam Peña-Alvarez
- Centre
for Science at Extreme Conditions, The University
of Edinburgh, Edinburgh EH8 8AQ, United
Kingdom
| |
Collapse
|