Controlled formation of metastable germanium polymorphs

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

doi:10.1103/PhysRevB.89.144111

Controlled formation of metastable germanium polymorphs

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

51 Citations (Scopus)

Abstract

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 has implications for the technological exploitation of Ge, but also for other tetrahedral systems.

Original language	English
Article number	144111
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	89
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.89.144111
Publication status	Published - 25 Apr 2014

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title = "Controlled formation of metastable germanium polymorphs",

abstract = "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 has implications for the technological exploitation of Ge, but also for other tetrahedral systems.",

author = "Bianca Haberl and Malcolm Guthrie and Malone, {Brad D.} and Smith, {Jesse S.} and Sinogeikin, {Stanislav V.} and Cohen, {Marvin L.} and Williams, {James S.} and Guoyin Shen and Bradby, {Jodie E.}",

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doi = "10.1103/PhysRevB.89.144111",

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T1 - Controlled formation of metastable germanium polymorphs

AU - Haberl, Bianca

AU - Guthrie, Malcolm

AU - Malone, Brad D.

AU - Smith, Jesse S.

AU - Sinogeikin, Stanislav V.

AU - Cohen, Marvin L.

AU - Williams, James S.

AU - Shen, Guoyin

AU - Bradby, Jodie E.

PY - 2014/4/25

Y1 - 2014/4/25

N2 - 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 has implications for the technological exploitation of Ge, but also for other tetrahedral systems.

AB - 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 has implications for the technological exploitation of Ge, but also for other tetrahedral systems.

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U2 - 10.1103/PhysRevB.89.144111

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M3 - Article

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VL - 89

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 14

M1 - 144111

ER -

Controlled formation of metastable germanium polymorphs

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