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Controlled formation of metastable germanium polymorphs

Haberl, Bianca; Guthrie, Malcolm; Malone, Brad D; Smith, Jesse S.; Sinogeikin, Stanislav V.; Cohen, Marvin L.; Williams, James; Shen, Guoyin; Bradby, Jodie

Description

The nucleation of metastable germanium polymorphs on decompression is studied using in situ synchrotron x-ray diffraction. We show that the transition pathway is critically dependent on the hydrostaticity. Quasihydrostatic conditions result in the nucleation of the rhombohedral r8 phase, followed by the cubic bc8 and hexagonal diamond phases. In contrast, the presence of shear yields the tetragonal st12 phase. Thus, targeted nucleation of a metastable polymorph is now possible. This observation...[Show more]

CollectionsANU Research Publications
Date published: 2014
Type: Journal article
URI: http://hdl.handle.net/1885/70314
Source: Physical Review B
DOI: 10.1103/PhysRevB.89.144111

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