TY - JOUR
T1 - High energy-resolution electron energy-loss spectroscopy study of the electronic structures of Li- and Mg-doped α-rhombohedral boron
AU - Terauchi, Masami
AU - Oguri, Atsushi
AU - Kimura, Kaoru
AU - Fujiwara, Akihiko
N1 - Funding Information:
The authors thank Mr F. Sato for his skilful technical assistance. This work was partly supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science and Culture of Japan.
PY - 2004
Y1 - 2004
N2 - 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.
AB - 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.
KW - Chemical shift
KW - Electron doping
KW - Fermi edge
KW - High energy-resolution EELS
KW - α-rhombohedral boron
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U2 - 10.1093/jmicro/dfh093
DO - 10.1093/jmicro/dfh093
M3 - Article
C2 - 15582971
AN - SCOPUS:13444309632
VL - 53
SP - 589
EP - 592
JO - Microscopy (Oxford, England)
JF - Microscopy (Oxford, England)
SN - 2050-5698
IS - 6
ER -