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

Abstract

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.more » • 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}.« less

Authors:
 [1]; ; ;  [1]; ;  [2]
  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)
Publication Date:
OSTI Identifier:
22742028
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 253; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Sato, Yohei, Saito, Taiki, Tsuchiya, Kohei, Terauchi, Masami, Saito, Hiroki, and Takeda, Masatoshi. Electron energy-loss and soft X-ray emission spectroscopy of electronic structure of MgB{sub 4}. United States: N. p., 2017. Web. doi:10.1016/J.JSSC.2017.05.007.
Sato, Yohei, Saito, Taiki, Tsuchiya, Kohei, Terauchi, Masami, Saito, Hiroki, & Takeda, Masatoshi. Electron energy-loss and soft X-ray emission spectroscopy of electronic structure of MgB{sub 4}. United States. doi:10.1016/J.JSSC.2017.05.007.
Sato, Yohei, Saito, Taiki, Tsuchiya, Kohei, Terauchi, Masami, Saito, Hiroki, and Takeda, Masatoshi. Fri . "Electron energy-loss and soft X-ray emission spectroscopy of electronic structure of MgB{sub 4}". United States. doi:10.1016/J.JSSC.2017.05.007.
@article{osti_22742028,
title = {Electron energy-loss and soft X-ray emission spectroscopy of electronic structure of MgB{sub 4}},
author = {Sato, Yohei and Saito, Taiki and Tsuchiya, Kohei and Terauchi, Masami and Saito, Hiroki and Takeda, Masatoshi},
abstractNote = {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}.},
doi = {10.1016/J.JSSC.2017.05.007},
journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = ,
volume = 253,
place = {United States},
year = {2017},
month = {9}
}