Journal
PHYSICAL REVIEW LETTERS
Volume 106, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.095503
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Funding
- U.K. Engineering and Physical Sciences Research Council
- Royal Society
- Engineering and Physical Sciences Research Council [EP/J003999/1] Funding Source: researchfish
- EPSRC [EP/J003999/1] Funding Source: UKRI
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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.
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