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It is accompanied by a large drop of which in turn promotes a uniform pressure over the sample, as evidenced from the sharpening of the high-frequency edge of a Raman spectrum from a diamond anvil (Fig. 1).
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It is accompanied by a large drop of volume, which in turn promotes a uniform pressure over the sample, as evidenced from the sharpening of the high-frequency edge of a Raman spectrum from a diamond anvil (Fig. 1).
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Materials and methods are available as supporting material on Science Online.
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Materials and methods are available as supporting material on Science Online.
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Although for symmetry reasons, H atoms in the tetrahedral interstices occupy centers of the cavities, there is some freedom in the choice of z coordinates of H atoms in the octahedral cavities. We have chosen the z coordinates for all positions in such a way that all H atoms are located at equal distances from surrounding Si atoms (Fig. 3C, This arrangement of H atoms corresponds to P63/mmc space group. However, because of the mentioned uncertainty of the coordinates of H atoms, further on we refer to this phase as the lowest consistent with hcp structure P63 symmetry, with Si atoms in the 2b positions (1/3, 2/3, 0) and H atoms in the positions 2a (0, 0, 0.131, 2a (0, 0, 0.369, 2b (2/3, 1/3, 0.131, and 2b 1/3, 2/3, 0.369, because H atoms occupy all interstices of hcp structure, they are forced to conform to at least this symmetry
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3 symmetry, with Si atoms in the 2b positions (1/3, 2/3, 0) and H atoms in the positions 2a (0, 0, 0.131), 2a (0, 0, 0.369), 2b (2/3, 1/3, 0.131), and 2b (1/3, 2/3, 0.369) (because H atoms occupy all interstices of hcp structure, they are forced to conform to at least this symmetry).
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3 structure.
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3 structure.
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We are grateful to A. Gavriliuk and V. Prakapenka for help in x-ray diffraction measurements at station Sector 13 Insertion Device Beamline (13ID-D) of the GeoSoilEnviro group of the Consortium for Advanced Radiation Sources (GSECARS) at the Advanced Photon Source under grant GUP7569 and GUP8324. We thank R. Boehler, Y. A. Freiman, I. Goncharenko, and V. Hillgren for fruitful discussions. Deutsche Forschungsgemeinschaft (DFG) grant ER 539/1-1 provided partial financial support
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We are grateful to A. Gavriliuk and V. Prakapenka for help in x-ray diffraction measurements at station Sector 13 Insertion Device Beamline (13ID-D) of the GeoSoilEnviro group of the Consortium for Advanced Radiation Sources (GSECARS) at the Advanced Photon Source under grant GUP7569 and GUP8324. We thank R. Boehler, Y. A. Freiman, I. Goncharenko, and V. Hillgren for fruitful discussions. Deutsche Forschungsgemeinschaft (DFG) grant ER 539/1-1 provided partial financial support.
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