XPS study of Ni-Mo-B amorphous ultra-fine particles prepared by chemical reduction

Junji Saida, Eiji Akiyama, Koji Hashimoto, Akihisa Inoue, Tsuyoshi Masumoto

Research output: Contribution to journalArticlepeer-review


Ni-Mo-B amorphous ultra-fine particles were prepared by a chemical reduction method using KBH4 as a reducing agent. The concentration of molybdenum contained in the ultra-fine particles is about 10 at% when 30∼ 40 mol% of metal ions in the solution are molybdenum. The molybdenum concentration in the particles becomes the maximum value of about 30 at% in the aqueous solution where 90 mol% of metal ions are molybdenum. The structure is amorphous for all samples and the particles diameter is 20-50 nm. The XPS Mo3d spectrum consists of Mo0, Mo4+, Mo5+ and Mo6+ as-precipitated sample. The simultaneous determination of the composition of the surface film and underlying alloy indicates the enrichment of molybdenum in the surface oxide film. Nickel and boron are also composed of the metallic and oxidized states, the latter of which is associated with the surface oxide film. The XPS analysis clearly reveals that molybdenum can be reduced to the metallic state by reductive coprecipitation with nickel and boron.

Original languageEnglish
Pages (from-to)79-83
Number of pages5
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Issue number1
Publication statusPublished - 1996


  • Amorphous ultra-fine particle
  • Chemical reduction
  • Nickel-molybdenum-boron alloy
  • X-ray photoelectron spectroscopy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry


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