The core structure of presolar graphite onions

Details The core structure of presolar graphite onions The core structure of presolar graphite onions

2001-10-28

arxiv.org/abs/astro-ph/0110585v1

Astrophys.J. 578 (2002) L153-L156

Astronomy and Astrophysics

Astrophysics

4 pages, 7 figures, 11 refs, see also http://www.umsl.edu/~fraundor/isocore.html

Scientific paper

10.1086/344633

Of the ``presolar particles'' extracted from carbonaceous chondrite dissolution residues, i.e. of those particles which show isotopic evidence of solidification in the neighborhood of other stars prior to the origin of our solar system, one subset has an interesting concentric graphite-rim/graphene-core structure. We show here that single graphene sheet defects in the onion cores (e.g. cyclopentane loops) may be observable edge-on by HREM. This could allow a closer look at models for their formation, and in particular strengthen the possibility that growth of these assemblages proceeds atom-by-atom with the aid of such in-plane defects, under conditions of growth (e.g. radiation fluxes or grain temperature) which discourage the graphite layering that dominates subsequent formation of the rim.

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