Structures and Potential Superconductivity in SiH4 at High Pressure: En Route to “Metallic Hydrogen”
Ji Feng, Wojciech Grochala, Tomasz Jaroń, Roald Hoffmann, Aitor Bergara, N. W. Ashcroft
DOI 10.1103/PhysRevLett.96.017006 · Physical Review Letters
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Abstract
A way to circumvent the high pressures needed to metallize hydrogen is to “precompress” it in hydrogen-rich molecules, a strategy probed theoretically for silane. We show that phases with tetrahedral SiH4 molecules should undergo phase transitions with sixfold- and eightfold-coordinate Si appearing above 25 GPa. The most stable structure found can be metallized at under a megabar and at a compression close to the prediction of Goldhammer-Herzfeld criterion. According to a BCS-like estimate, metallic silane should be a high-temperature superconductor.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| SiH4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 166 | 202 GPa | unknown |
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