Electron energy-loss and soft X-ray emission spectroscopy of electronic structure of MgB{sub 4}

Journal Article · Fri Sep 15 00:00:00 EDT 2017 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2017.05.007· OSTI ID:22742028

Sato, Yohei ^[1]; Saito, Taiki; Tsuchiya, Kohei; Terauchi, Masami ^[1]; Saito, Hiroki; Takeda, Masatoshi ^[2]

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1. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577 (Japan)
2. Department of Mechanical Engineering, Nagaoka University of Technology, Kamitomioka, 1603-1, Nagaoka, Niigata 940-2188 (Japan)

The electronic structure of MgB{sub 4}, with the characteristic crystal structure comprising one-dimensional pentagonal B{sub 6} cluster chain, was investigated using electron energy-loss spectroscopy and soft X-ray emission spectroscopy based on transmission electron microscopy. The dielectric function and density of state of unoccupied and occupied states were clarified experimentally for the first time. Although theoretical calculations has predicted MgB{sub 4} to be a semiconductor, the electron energy-loss spectrum in this study show a plasmon peak at 0.4 eV, which might be due to carrier electrons. Theoretical calculations suggested that the electronic states near the Fermi energy are localized along the one dimensional B{sub 6} cluster chain. Therefore, one–dimensional electric conductivity is expected. - Graphical abstract: Crystal structure of MgB{sub 4} consists of one-dimensional B{sub 6} cluster chain. The electronic structure characteristic to one-dimensionality is explored by using experimental EELS and SXES measurements based on TEM and first principle calculation. Display Omitted - Highlights: • The electronic structure of MgB{sub 4} is investigated using EELS and SXES based on TEM. • The peak at 0.4 eV in low-loss spectrum implies carriers with low density. • DOSs in VB and CB were revealed from B K emission and B K-shell excitation spectra. • Wien2K shows electronic states near Fermi level located along B{sub 6} cluster chains. • One dimensional behavior of the carriers is expected in MgB{sub 4}.

• OSTI ID: 22742028
• Journal Information: Journal of Solid State Chemistry, Vol. 253; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BORIDES
CHAINS
CRYSTAL STRUCTURE
DIELECTRIC MATERIALS
ELECTRIC CONDUCTIVITY
ENERGY LOSSES
ENERGY SPECTRA
ENERGY-LOSS SPECTROSCOPY
FERMI LEVEL
K SHELL
ONE-DIMENSIONAL CALCULATIONS
SEMICONDUCTOR MATERIALS
SOFT X RADIATION
TRANSMISSION ELECTRON MICROSCOPY
X-RAY EMISSION SPECTROSCOPY
X-RAY SPECTROSCOPY