Impact-formed complex diamond-graphite nanostructures

Author:

Németh Péter1ORCID,McColl Kit2,Garvie Laurence A.J.3,Corà Furio4,Salzmann Christoph G.4,McMillan Paul F.4

Affiliation:

1. Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences, Eötvös Loránd Research Network, Budaörsi út 45, Budapest, Hungary

2. Department of Chemistry, University of Bath, Bath, UK

3. Buseck Center for Meteorite Studies, Arizona State University, Tempe, AZ 85287, USA

4. Department of Chemistry, University College London, 20 Gordon Street, London, UK

Abstract

AbstractShock waves resulting from asteroidal and laboratory impacts convert sp2-bonded graphitic material to sp3-bonded diamond. Depending on the shock pressure and temperature conditions, complex nanostructures can form that are neither graphite nor diamond but belong to the diaphite material group, which are characterized by structurally intergrown layered sp2- and sp3-bonded carbon domains. Our ultrahigh-resolution transmission electron microscopy images combined with density functional theory calculations demonstrate that diaphites have two related but distinct structural families. Here, we describe diaphite nanostructures from natural and laboratory shocked samples, provide a framework for classifying the members of these materials, and draw attention to their excellent mechanical and electronic material properties.

Funder

Hungarian National Research, Development and Innovation Office project

János Bolyai Research Scholarship

New National Excellence Program of the Ministry for Innovation and Technology

NASA Emerging Worlds

Horizon 2020 Research and Innovation program

EPSRC

Publisher

Akademiai Kiado Zrt.

Subject

General Medicine

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