Relative stability of hexagonal and planar structures of hypotheticalsolids
- 15 January 1995
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 51 (4), 2624-2627
- https://doi.org/10.1103/physrevb.51.2624
Abstract
We have performed a first-principles electronic-structure study of a planar structural form of a hypothetical solid and compared its energy to a fully three-dimensional form. We use a mixed basis of pseudoatomic orbitals and low-kinetic-energy plane waves to determine the single-particle Kohn-Sham wave functions. These results are tested against fully converged plane-wave-basis calculations. We find that the proposed planar form of (p- ) is lower in energy than the hexagonal form β- . However, the energy difference between the two phases is small. The hexagonal β- phase is insulating, with an indirect gap, while the planar form p- has a semimetallic electronic structure.
Keywords
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