Metastable BC3 honeycomb epitaxial sheets on the NbB2(0 0 0 1) surface

H. Yanagisawa, Y. Ishida, T. Tanaka, A. Ueno, S. Otani, C. Oshima

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14 Citations (Scopus)

Abstract

During the growth of stable BC3 (s-BC3) sheets on NbB2(0 0 0 1), metastable BC3 (m-BC3) honeycomb epitaxial sheets appeared first. The properties of the m-BC3 sheets were investigated by using LEED, AES, HREELS, and ab initio calculations. The observed lattice constant was longer by 5% than that of the s-BC3 sheets, while the stoichiometric ratio of boron to carbon of the m-BC3 was almost the same as that of the s-BC3. The observed energies of the longitudinal optical and longitudinal acoustic phonons with in-plane polarization were lower than those of the s-BC3 sheets, which indicated a reduction of the force constants due to the lattice expansion. The experimental phonon energies of the m-BC3 sheets were in good agreement with those generated by ab initio calculations of the lattice dynamics for an optimized monolayer-model structure. This structure was determined by optimizing the atomic positions in a unit cell with the observed lattice constant; the optimized values of the C-C and B-C bond lengths were lC-C = 0.146 nm and lB-C = 0.164 nm.

Original languageEnglish
Pages (from-to)4072-4076
Number of pages5
JournalSurface Science
Volume600
Issue number18
DOIs
Publication statusPublished - 2006 Sep 15

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Keywords

  • AES
  • BC3
  • Crystal growth
  • HREELS
  • LEED
  • Metastable
  • Surface segregation
  • Surface structure
  • Thin film

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Yanagisawa, H., Ishida, Y., Tanaka, T., Ueno, A., Otani, S., & Oshima, C. (2006). Metastable BC3 honeycomb epitaxial sheets on the NbB2(0 0 0 1) surface. Surface Science, 600(18), 4072-4076. https://doi.org/10.1016/j.susc.2006.01.124