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Families of Superhard Crystalline Carbon Allotropes Constructed via Cold Compression of Graphite and Nanotubes
We report a general scheme to systematically construct two classes of structural families of superhard sp(3) carbon allotropes of cold-compressed graphite through the topological analysis of odd 5+7 or even 4+8 membered carbon rings stemmed from the stacking of zigzag and armchair chains. Our results show that the previously proposed …