Stability and crystal structure of BC8 germanium

Nelmes, R. J.; McMahon, M. I.; Wright, N. G.; Allan, D. R.; Loveday, J. S.

doi:10.1103/physrevb.48.9883

Cited by 152 publications

(137 citation statements)

References 17 publications

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“…This transition is reconstructive because it involves a complete reorganization of the interatomic bonding. On rapid release of pressure at room temperature from the ␤-Sn phase, the diamond structure is not recovered, but the metastable fourfoldcoordinated bc8 phase appears, which over a period of about a day transforms into a phase that is believed to have the same structure as Si-IV (Nelmes, McMahon, Wright, Allan, and Loveday, 1993; see Sec. VII.A.2.e).…”

Section: Solid-solid Phase Transitionsmentioning

confidence: 99%

“…͓bc8(IV)͔←␤-Sn(II) (rapid) Menoni et al, 1986 (EDX) 10.6(5) 18.9(7) cd→␤-Sn 7.4 18.4 Mujica et al, 2001aNelmes, Liu, et al, 1996 Menoni et al, 1986 (EDX) 7.6(5) 9.2(10) ‡ ͓st12͔←␤-Sn 5.7 6.7 Mujica et al, 2001aNelmes, McMahon, Wright, Allan, and Loveday, 1993 (ADX) et al, 2001a, 2001b Observations: ( †) Extrapolated value; ( ‡) Calculated as (…”

Section: A Cd→␤-snmentioning

confidence: 99%

“…The bc8 phase (Kasper and Richards, 1964) remains as a metastable phase under normal conditions. However, moderate heating of the bc8 phase results in a transformation to a phase Si-IV which has been identified as having the hexagonal-diamond structure (Wentorf and Kasper, 1963;Besson et al, 1987), though this assignment has been challenged (Nelmes, McMahon, Wright, Allan, and Loveday, 1993). In a single experimental study in which the ␤-Sn-Si phase was brought rapidly to ambient pressure under different conditions, two other different phases, believed to consist of large tetragonal unit cells, were reported (Zhao et al, 1986).…”

Section: E Phases Obtained On Decrease Of Pressurementioning

confidence: 99%

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High-pressure phases of group-IV, III–V, and II–VI compounds

et al. 2003

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Advances in the accuracy and efficiency of first-principles electronic structure calculations have allowed detailed studies of the energetics of materials under high pressures. At the same time, improvements in the resolution of powder x-ray diffraction experiments and more sophisticated methods of data analysis have revealed the existence of many new and unexpected high-pressure phases. The most complete set of theoretical and experimental data obtained to date is for the group-IVA elements and the group-IIIA-VA and IIB-VIA compounds. Here the authors review the currently known structures and high-pressure behavior of these materials and the theoretical work that has been done on them. The capabilities of modern first-principles methods are illustrated by a full comparison with the experimental data. CONTENTS

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Section: Solid-solid Phase Transitionsmentioning

confidence: 99%

Section: A Cd→␤-snmentioning

confidence: 99%

Section: E Phases Obtained On Decrease Of Pressurementioning

confidence: 99%

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High-pressure phases of group-IV, III–V, and II–VI compounds

et al. 2003

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“…100 Stable Ge NPs with ST12 structures have already been obtained in a wide range of sizes 101 and are surprisingly stable, up to 500 C at ambient pressure. A recent study reported the formation of Ge ST12 NPs upon lithiation of diamond-like Ge NPs.…”

Section: High Pressure Core Structuresmentioning

confidence: 99%

Novel silicon phases and nanostructures for solar energy conversion

Wippermann

Vörös

et al. 2016

Applied Physics Reviews

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Silicon exhibits a large variety of different bulk phases, allotropes, and composite structures, such as, e.g., clathrates or nanostructures, at both higher and lower densities compared with diamond-like Si-I. New Si structures continue to be discovered. These novel forms of Si offer exciting prospects to create Si based materials, which are non-toxic and earth-abundant, with properties tailored precisely towards specific applications. We illustrate how such novel Si based materials either in the bulk or as nanostructures may be used to significantly improve the efficiency of solar energy conversion devices.

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“…X-ray powder diffraction patterns recorded at 180 GPa indicate that the element has transformed into an hcp arrangement [60,61]. Upon rapid decompression from the b-tin type arrangement at 14 GPa to ambient pressure, germanium forms additionally to the structurally characterized metastable ST12 modification [57] a second phase which is isotypic to BC8 silicon [62].…”

Section: Silicon and Germanium (Tetrels)mentioning

confidence: 99%

Metallic high-pressure modifications of main group elements

Schwarz¹

2004

Zeitschrift Für Kristallographie - Crystalline Materials

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Abstract. The high-pressure structural chemistry of main group elements in the metallic state is reviewed under consideration of more recent determinations of atomic arrangements with to some extend unexpected complexity. Following the concept of the pressure-coordination rule, the number of nearest neighbours is employed as a guiding quantity to reveal systematic trends. Violations of the rule will be mainly discussed in the light of electronic ground state changes upon compression.

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Stability and crystal structure of BC8 germanium

Cited by 152 publications

References 17 publications

High-pressure phases of group-IV, III–V, and II–VI compounds

High-pressure phases of group-IV, III–V, and II–VI compounds

Novel silicon phases and nanostructures for solar energy conversion

Metallic high-pressure modifications of main group elements

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