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Phys Rev Lett. 2013 Feb 22;110(8):085502. Epub 2013 Feb 20.

Evidence for the R8 phase of germanium.

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  • 1School of Physics, University of Melbourne, Victoria 3010, Australia.


The formation of R8 germanium is reported. The β-Sn phase is first induced by the indentation of amorphous germanium (a-Ge) and the resultant phases on pressure release are characterized by Raman scattering. The expected Raman line frequencies for the various phases of Ge are determined from first-principles calculations using density functional perturbation theory of the zone-center phonons in the diamond, ST12, BC8, and R8 Ge phases. In addition to the R8 phase, traces of BC8 may also be present following pressure release.

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