Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8160489 | Physica B: Condensed Matter | 2018 | 6 Pages |
Abstract
To study the electrical properties of hydrogen rich compounds under extreme conditions, the electrical resistivity of density hydrogen and silane fluid was measured, respectively. The hydrogen sample was prepared by compressing pure hydrogen gas to 10â¯MPa in a coolant target system at the temperature of 77â¯K. The silane sample can be obtained with the same method. High-pressure and high-temperature experiments were performed using a two-stage light-gas gun. The electrical resistivity of the sample decreased with increasing pressure and temperature as expected. A minimum electrical resistivity value of 0.3â¯Ãâ¯10-3â¯Î©â¯cm at 138â¯GPa and 4100â¯K was obtained for silane. The minimum resistivity of hydrogen in the state of 102â¯GPa and 4300â¯K was 0.35â¯Î©â¯cm. It showed that the measured electrical resistivity of the shock-compressed hydrogen was an order of magnitude higher than fluid silane at 50-90â¯GPa. However, beyond 100â¯GPa, the resistivity difference between silane and hydrogen was very minor. The carriers in the sample were hydrogen, and the concentration of hydrogen atoms in these two substances was close to each other. These results supported the theoretical prediction that silane was interpreted simply in terms of chemical decomposition into silicon nanoparticles and fluid hydrogen, and electrical conduction flows predominately dominated by the fluid hydrogen. In addition, the results also supported the theory of “chemical precompression”, the existence of SiH bond helped to reduce the pressure of hydrogen metallization. These findings could lead the way for further metallic phases of hydrogen-rich materials and experimental studies.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Yi-Gao Wang, Fu-Sheng Liu, Qi-Jun Liu,