Formation of ordered B structure on W(100)

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

研究成果: Contribution to journalArticle査読

1 被引用数 (Scopus)

抄録

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.

本文言語英語
論文番号121906
ジャーナルSurface Science
713
DOI
出版ステータス出版済み - 11 2021

All Science Journal Classification (ASJC) codes

  • 凝縮系物理学
  • 表面および界面
  • 表面、皮膜および薄膜
  • 材料化学

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