High-Pressure Synthesis, Amorphization, and Decomposition of Silane

Michael Hanfland, John E. Proctor, Christophe L. Guillaume, Olga Degtyareva, Eugene Gregoryanz

Research output: Contribution to journalArticlepeer-review

Abstract

By compressing elemental silicon and hydrogen in a diamond anvil cell, we have synthesized polymeric silicon tetrahydride (SiH(4)) at 124 GPa and 300 K. In situ synchrotron x-ray diffraction reveals that the compound forms the insulating I4(1)/a structure previously proposed from ab initio calculations for the high-pressure phase of silane. From a series of high-pressure experiments at room and low temperature on silane itself, we find that its tetrahedral molecules break up, while silane undergoes pressure-induced amorphization at pressures above 60 GPa, recrystallizing at 90 GPa into the polymeric crystal structures.

Original languageEnglish
Article number095503
Number of pages4
JournalPhysical Review Letters
Volume106
Issue number9
DOIs
Publication statusPublished - 2 Mar 2011

Keywords

  • SIH4
  • SUPERCONDUCTIVITY

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