High-pressure Raman spectroscopy of antimony: As-type, incommensurate host-guest, and bcc phases |
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Authors: | Olga Degtyareva Viktor V. Struzhkin Russell J. Hemley |
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Affiliation: | Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Rd. N.W., Washington DC 20015, USA |
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Abstract: | The vibrational dynamics of elemental solids that form incommensurate host-guest structures are of fundamental interest. High-pressure Raman scattering has been used to examine the vibrational spectrum of the group-V element Sb up to 33 GPa. A1g and Eg phonons of the ambient pressure rhombohedral A7 phase display a marked decrease with pressure, i.e., prior to the transition to the tetragonal host-guest Sb-II phase at 8.6 GPa, via the monoclinic host-guest Sb-IV phase. The Raman spectrum of the incommensurate host-guest Sb-II phase, has five bands between 80 cm−1 and 200 cm−1 that increase with pressure. For the bcc structure stable above 28 GPa, we observe one weak disorder-induced band that increases with pressure. |
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Keywords: | 62.50.+p 63.20.-e 78.30.-j |
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