Formation of ordered B structure on W(100)

Farhana Jesmin Tuli, Guansong Peng, Shahadat Hossain, Kakeru Ninomiya, Rezwan Ahmed, Takeshi Nakagawa, Seigi Mizuno

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1 Citation (Scopus)

Abstract

Adsorption of a metalloid, boron (B) on W(100) was investigated using low energy electron diffraction (LEED), X-ray photoelectron spectroscopy (XPS) and scanning tunneling microscopy (STM) in ultra-high vacuum (UHV) condition. W(100)-c(2 × 2)-B superstructure was formed by annealing at high temperature (1200 K). The best fit structure obtained from LEED analysis and STM observation manifested that B atom positioned at four-fold hollow site with the coverage of 0.5 ML, forming low B concentrated tungsten boride compound, W2B, on W(100) surface. The W atoms beneath B atoms moved downward to form B-W bonds for stabilizing the surface atoms. XPS confirmed B 1s peak shifting towards lower binding energy compared to pure B 1s, which indicated the charge transfer from W to B. No ordered structures other than c(2 × 2) have been observed with the increase of B, which indicates that B atoms diffuse into bulk, not forming ordered B sheets, due to the low diffusion barrier into bulk by annealing.

Original languageEnglish
Article number121906
JournalSurface Science
Volume713
DOIs
Publication statusPublished - 2021 Nov

Keywords

  • Boron
  • Low energy diffraction
  • Scanning tunneling microscopy
  • Surface structure

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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