New Superhard Phases for 3D C60-based Fullerites

Details New Superhard Phases for 3D C60-based Fullerites New Superhard Phases for 3D C60-based Fullerites

2000-07-14

arxiv.org/abs/cond-mat/0007247v1

Physics

Condensed Matter

Materials Science

To be published in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.85.2328

We have explored new possible phases of 3D C60-based fullerites using semiempirical potentials and ab-initio density functional methods. We have found three closely related structures - two body centered orthorhombic and one body centered cubic - having 52, 56 and 60 tetracoordinated atoms per molecule. These 3D polymers result in semiconductors with bulk moduli near 300 GPa, and shear moduli around 240 GPa, which make them good candidates for new low density superhard materials.

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