High energy-resolution electron energy-loss spectroscopy study of the electronic structures of Li- and Mg-doped α-rhombohedral boron

Masami Terauchi, Atsushi Oguri, Kaoru Kimura, Akihiko Fujiwara

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Electron-doped α-rhombohedral boron (α-r-B) crystals were synthesized by Li- and Mg-dopings. The doped α-r-B particles showed a shiny metallic colour, though non-doped α-r-B crystals showed a dark red colour (red boron). The electronic structures of doped α-r-B single crystals were examined by a high energy-resolution electron energy-loss spectroscopy microscope. Boron Is electron-excitation spectra, which show the density of states of the conduction bands, of Li-doped α-r-B showed a chemical shift toward a smaller binding-energy side, indicating a charge transfer from the doped atoms to α-r-B. These spectra also showed a sharp intensity increase at the onset with a width of an energy resolution of the experiment. The sharp intensity increase may be assigned to a Fermi edge produced by the electron doping. The spectra of Mg-doped α-r-B showed a chemical shift indicating an electron doping, but did not show the presence of a Fermi edge.

Original languageEnglish
Pages (from-to)589-592
Number of pages4
JournalJournal of Electron Microscopy
Volume53
Issue number6
DOIs
Publication statusPublished - 2004

Keywords

  • Chemical shift
  • Electron doping
  • Fermi edge
  • High energy-resolution EELS
  • α-rhombohedral boron

ASJC Scopus subject areas

  • Instrumentation

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