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The diameter of a cluster (its real shape is not a sphere, but a cubeoctahedron) is estimated from the radius of an equivalent, sphere, which volume equals the sum of volume increments VSi and VC for appropriate numbers of Si and C atoms, respectively. Volume increments per SiC unit (thus, VSi+VC) are taken from calculations of 3C-SiC. The ratio of VSi and VC is assumed to scale as the cube of their covalent radii. Finally, we use VC=5. 00 Å3 and VSi = 15. 98 Å3. Note that our definition of a radius for a cluster does not include a contribution from H atoms.

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