Surface phonons of LaB6(100): deformation of boron octahedra at the surface

Nagao Tadaaki*, Kitamura Kazuo, Iizuka Yoshitaka, Oshima Chuhei, Shigeki Otani

*この研究の対応する著者

研究成果: Article査読

33 被引用数 (Scopus)

抄録

The surface phonon dispersion of clean LaB6(100) surface has been measured by means of high resolution electron energy loss spectroscopy. Eight vibrational modes, of which most are located in the energy gaps between the bulk phonon bands, have been detected. The lattice dynamical calculation of a slab-shaped crystal based on a force constant model has reproduced these experimental dispersion curves, which indicates the large increase in the force constant of interoctahedral boron-boron bond at the surface by 25%, and the large decrease in the force constants of intraoctahedral boron-boron bonds at the surface by 25-50%. These changes together with the analysis of the bulk phonon structure of metal hexaborides strongly suggest that the boron octahedra at the surface are expanded by about 0.004 nm parallel to the surface.

本文言語English
ページ(範囲)436-444
ページ数9
ジャーナルSurface Science
290
3
DOI
出版ステータスPublished - 1993 6月 20

ASJC Scopus subject areas

  • 物理化学および理論化学
  • 凝縮系物理学
  • 表面および界面

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