Surface structures and work functions of the LaB6 (100), (110) and (111) clean surfaces

R. Nishitani, M. Aono, T. Tanaka, C. Oshima, S. Kawai, H. Iwasaki, S. Nakamura

    Research output: Contribution to journalArticlepeer-review

    85 Citations (Scopus)

    Abstract

    The structures of the LaB6 (110) and (111) clean surfaces have been studied by angleresolved XPS, ISS and LEED. The LaB6 (110) clean surface has the relaxed and reconstructed c(2 × 2) structure where the surface lanthanum atoms are displaced toward the surface and a c(2 × 2) overlayer structure is caused by a displacement of the surface lanthanum atoms. The LaB6 (111) clean surface has the relaxed (1 × 1) structure where the surface lanthanum atoms are displaced toward the surface. The work functions of the (100), (110) and (111) surfaces have been measured from the width of UPS spectra and are ~2.3, ~2.5 and ~3.3 eV, respectively. The anisotropy of the work functions has been correlated with the surface structures. The origin of the unusually low work functions of the LaB6 (100) and (110) clean surfaces in refractory materials is interpreted by electric dipole moments produced by positive charges of surface lanthanum ions.

    Original languageEnglish
    Pages (from-to)535-549
    Number of pages15
    JournalSurface Science
    Volume93
    Issue number2-3
    DOIs
    Publication statusPublished - 1980 Mar 2

    ASJC Scopus subject areas

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

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