New self-intercalated C28, Ti@C28, and Zn@C28 hyperdiamonds: Crystal structure and elastic and electronic properties
- 1 December 2007
- journal article
- Published by Pleiades Publishing Ltd in JETP Letters
- Vol. 86 (8), 537-542
- https://doi.org/10.1134/s002136400720009x
Abstract
New dense crystal forms of small fullerenes with unusual (combined covalent-van der Waals) atomic bonding, namely, the so-called self-intercalated hyperdiamonds (SIHDs) are suggested. The SIHD systems consist of C28 fullerenes and Ti@C28 and Zn@C28 endofullerenes compacted into diamond lattices, in which the voids are filled with the same fullerenes. The electron density functional method in the tight binding approximation is applied to simulate the structure and to calculate the elasticity parameters, electronic characteristics, and formation energy of C28, Ti@C28, and Zn@C28 SIHDs. It is found that the values of the bulk modulus of the SIHDs are much (2.3–2.7 times) greater than those of the initial hyperdiamonds. It is found that the C28 SIHD is a semiconductor with a band gap of about 1.3 eV, whereas the Ti@C28 and Zn@C28 SIHDs exhibit metal-like electronic spectra. For the alternative diamond-like C28 phases (hyperdiamond, hyperlonsdaleite, and SIHD), the theoretical shape of the x-ray diffraction spectra is calculated.Keywords
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