Electronic and mechanical properties of planar and tubular boron structures

M. H. Evans, J. D. Joannopoulos, and S. T. Pantelides
Phys. Rev. B 72, 045434 – Published 15 July 2005

Abstract

We report the results of first-principles calculations showing that boron can form a wide variety of metastable planar and tubular forms with unusual electronic and mechanical properties. The preferred planar structure is a buckled triangular lattice that breaks the threefold ground state degeneracy of the flat triangular plane. When the plane is rolled into a tube, the ground state degeneracy leads to a strong chirality dependence of the binding energy and elastic response, an unusual property that is not found in carbon nanotubes. The achiral (n,0) tubes derive their structure from the flat triangular plane. The achiral (n,n) boron nanotubes arise from the buckled plane, and have large cohesive energies and different structures as a result. (n,n) boron nanotubes have an internal relaxation mechanism that results in a very low Poisson ratio. The strong variation in elastic properties of boron nanotubes makes them the mechanical analogue of carbon nanotubes, and may make them ideal candidates for applications in composite materials and nanoelectromechanical systems.

    • Received 28 March 2005

    DOI:https://doi.org/10.1103/PhysRevB.72.045434

    ©2005 American Physical Society

    Authors & Affiliations

    M. H. Evans1,2, J. D. Joannopoulos1, and S. T. Pantelides2,3

    • 1Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
    • 2Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA
    • 3Condensed Matter Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

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    Issue

    Vol. 72, Iss. 4 — 15 July 2005

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