Ionicities of Boron-Boron Bonds inIcosahedra
- 14 January 2005
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 94 (1), 015504
- https://doi.org/10.1103/physrevlett.94.015504
Abstract
First-principles calculations are used to investigate ionicities of boron-boron bonds in icosahedra. It is observed that the geometrical symmetry breaking of icosahedra results in the spatial asymmetry of charge density on each boron-boron bond, and further in the ionicity of icosahedra. The results calculated by a new ionicity scale, a population ionicity scale, indicate that the maximum ionicity among those boron-boron bonds is larger than that of boron-nitrogen bonds in the III-V compound cubic BN. It is of great importance that such an ionicity concept can be extended to boron-rich solids and identical atom clusters.
Keywords
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