Resistivity behavior of hydrogen and liquid silane at high shock compression
| Autor: | Yi-Gao Wang, Fu-Sheng Liu, Qi-Jun Liu |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Silanes
Materials science Silicon Hydrogen Hydrogen bond Analytical chemistry chemistry.chemical_element 02 engineering and technology Atmospheric temperature range 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Silane Electronic Optical and Magnetic Materials Coolant chemistry.chemical_compound chemistry Electrical resistivity and conductivity 0103 physical sciences Electrical and Electronic Engineering 010306 general physics 0210 nano-technology |
| Zdroj: | Physica B: Condensed Matter. 541:89-94 |
| ISSN: | 0921-4526 |
| Popis: | 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 10 MPa in a coolant target system at the temperature of 77 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 0.3 × 10-3 Ω cm at 138 GPa and 4100 K was obtained for silane. The minimum resistivity of hydrogen in the state of 102 GPa and 4300 K was 0.35 Ω cm. It showed that the measured electrical resistivity of the shock-compressed hydrogen was an order of magnitude higher than fluid silane at 50–90 GPa. However, beyond 100 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 Si H 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. |
| Databáze: | OpenAIRE |
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