Evidence for the R8 Phase of Germanium
Abstract
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.
- Publication:
-
Physical Review Letters
- Pub Date:
- February 2013
- DOI:
- Bibcode:
- 2013PhRvL.110h5502J
- Keywords:
-
- 61.50.Ks;
- 63.20.D-;
- 71.15.Mb;
- Crystallographic aspects of phase transformations;
- pressure effects;
- Phonon states and bands normal modes and phonon dispersion;
- Density functional theory local density approximation gradient and other corrections