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Updated: Jul 8, 2026
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Published on: February 8, 2022
Pressure-induced metallization of silane
Xiao-Jia Chen1, Viktor V Struzhkin, Yang Song
1Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, USA.
Summary
Silane (SiH(4)) transforms into a polymeric structure under extreme pressure, eventually becoming metallic above 60 GPa. This study explores electronic transitions in hydrogen-rich materials under high pressure.
Area of Science:
- Materials Science
- Condensed Matter Physics
- High-Pressure Physics
Background:
- Hydrogen-rich materials are of interest for electronic transitions under extreme conditions.
- Group IVa hydrides like silane (SiH(4)) may metallize at lower pressures than pure hydrogen due to chemical compression.
Purpose of the Study:
- To investigate the high-pressure behavior of silane (SiH(4)).
- To determine the pressure-induced phase transitions and metallization onset in silane.
Main Methods:
- Measurements of Raman and infrared spectra of silane under pressure.
- Room-temperature infrared reflectivity measurements.
Main Results:
- Silane (SiH(4)) exhibits three phase transitions before becoming opaque at 27-30 GPa.
- Vibrational spectra suggest a transformation to a polymeric structure at higher pressures.
- Infrared reflectivity indicates Drude-like metallic behavior above 60 GPa, signifying metallization.
Conclusions:
- Silane (SiH(4)) undergoes significant structural changes under pressure.
- Pressure-induced metallization of silane occurs above 60 GPa, driven by structural transformation.
