<i>Imma</i> phase of germanium at ∼80 GPa

R. J. Nelmes; H. Liu; S. A. Belmonte; J. S. Loveday; M. I. McMahon; D. R. Allan; D. Häusermann; M. Hanfland

doi:10.1103/PhysRevB.53.R2907

Rapid Communication

Imma phase of germanium at ∼80 GPa

R. J. Nelmes, H. Liu, S. A. Belmonte, J. S. Loveday, M. I. McMahon, D. R. Allan, D. Häusermann, and M. Hanfland

Phys. Rev. B 53, R2907(R) – Published 1 February 1996

Abstract

Ge has been studied to 81 GPa with angle-dispersive diffraction techniques, using an image-plate area detector and high-brilliance synchrotron radiation from the European Synchrotron Radiation Facility. A previously unknown phase of Ge, with orthorhombic symmetry Imma, is found to exist above ∼75 GPa—between the well established $β$ -tin and simple hexagonal phases. This phase is the same as that found recently between the $β$ -tin and simple hexagonal phases of Si.