Symmetry-driven phase transformations in single-wall carbon-nanotube bundles under hydrostatic pressure

Marcel H.F. Sluiter, Vijay Kumar, Yoshiyuki Kawazoe

Research output: Contribution to journalArticle

Abstract

Ab initio calculations on (10,10) and (12,12) single-wall carbon-nanotube bundles show that the nature of the phase transformation under hydrostatic pressure is determined by the symmetry of the nanotubes. Bundles of (10,10) nanotubes that are incommensurate with the hexagonal lattice, have small deviations from hexagonal symmetry of the lattice even at zero pressure. A transition to monoclinic structure is obtained at about 1 GPa within the generalized gradient approximation such that the nanotubes transform to an oval shape. However, in the local-density approximation the monoclinic phase is retained even at zero pressure once the transformation has occurred. Bundles of (12,12) nanotubes are commensurate with the hexagonal symmetry of the lattice and show no transition even up to 6 GPa pressure except for a polygonization of the initially cylindrical nanotubes into a hexagonal shape. These results would resolve the contradictory conclusions obtained from experiments.

Original languageEnglish
Pages (from-to)1-4
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number16
DOIs
Publication statusPublished - 2002 Jan 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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