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Pressure-Induced Amorphization and a New High Density Amorphous Metallic Phase in Matrix-Free Ge Nanoparticles

Abstract: Over the last two decades, it has been demonstrated that size effects have significant consequences for the atomic arrangements and phase behavior of matter under extreme pressure. Furthermore, it has been shown that an understanding of how size affects critical pressure-temperature conditions provides vital guidance in the search for materials with novel properties. Here, we report on the remarkable behavior of small (under 5 nm) matrix-free Ge nanoparticles under hydrostatic compression that is drastically different from both larger nanoparticles and bulk Ge. We discover that the application of pressure drives surface-induced amorphization leading to Ge-Ge bond overcompression and eventually to a polyamorphic semiconductor-to-metal transformation. A combination of spectroscopic techniques together with ab initio simulations were employed to reveal the details of the transformation mechanism into a new high density phase - amorphous metallic Ge. © 2015 American Chemical Society.

 Fuente: Nano Lett. 2015, 15, 7334-7340

Editorial: ACS Publications

 Año de publicación: 2015

Nº de páginas: 7

Tipo de publicación: Artículo de Revista

 DOI: 10.1021/acs.nanolett.5b02627

ISSN: 1530-6984,1530-6992

Url de la publicación: http://pubs.acs.org/doi/10.1021/acs.nanolett.5b02627

Autores/as

CORSINI, NICCOLO R. C.

ZHANG, YUANPENG

LITTLE, WILLIAM R.

KARATUTLU, ALI

ERSOY, OSMAN

HAYNES, PETER D.

MOLTENI, CARLA

HINE, NICHOLAS D. M.

BRAZHKIN, VADIM V.

SAPELKIN, ANDREI