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Ogitsu T, Schwegler E, Galli G. β-Rhombohedral Boron: At the Crossroads of the Chemistry of Boron and the Physics of Frustration. Chem Rev 2013; 113:3425-49. [DOI: 10.1021/cr300356t] [Citation(s) in RCA: 149] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tadashi Ogitsu
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California
94550, United States
| | - Eric Schwegler
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California
94550, United States
| | - Giulia Galli
- University of California, Davis, California 95616,
United States
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Adasch V, Schroeder M, Kotzott D, Ludwig T, Vojteer N, Hillebrecht H. Synthesis, Crystal Structure, and Properties of MgxB50C8 or Mgx(B12)4(CBC)2(C2)2 (x = 2.4−4). J Am Chem Soc 2010; 132:13723-32. [DOI: 10.1021/ja102659d] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Volker Adasch
- DRONCO AG, Wiesenmühle 1, D-95632 Wunsiedel, Germany, Institut für Anorganische und Analytische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, D-79104 Freiburg, Germany, and Freiburger Materialforschungszentrum FMF, Stefan-Maier-Strasse 25, D-79104 Freiburg, Germany
| | - Melanie Schroeder
- DRONCO AG, Wiesenmühle 1, D-95632 Wunsiedel, Germany, Institut für Anorganische und Analytische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, D-79104 Freiburg, Germany, and Freiburger Materialforschungszentrum FMF, Stefan-Maier-Strasse 25, D-79104 Freiburg, Germany
| | - Dominik Kotzott
- DRONCO AG, Wiesenmühle 1, D-95632 Wunsiedel, Germany, Institut für Anorganische und Analytische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, D-79104 Freiburg, Germany, and Freiburger Materialforschungszentrum FMF, Stefan-Maier-Strasse 25, D-79104 Freiburg, Germany
| | - Thilo Ludwig
- DRONCO AG, Wiesenmühle 1, D-95632 Wunsiedel, Germany, Institut für Anorganische und Analytische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, D-79104 Freiburg, Germany, and Freiburger Materialforschungszentrum FMF, Stefan-Maier-Strasse 25, D-79104 Freiburg, Germany
| | - Natascha Vojteer
- DRONCO AG, Wiesenmühle 1, D-95632 Wunsiedel, Germany, Institut für Anorganische und Analytische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, D-79104 Freiburg, Germany, and Freiburger Materialforschungszentrum FMF, Stefan-Maier-Strasse 25, D-79104 Freiburg, Germany
| | - Harald Hillebrecht
- DRONCO AG, Wiesenmühle 1, D-95632 Wunsiedel, Germany, Institut für Anorganische und Analytische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, D-79104 Freiburg, Germany, and Freiburger Materialforschungszentrum FMF, Stefan-Maier-Strasse 25, D-79104 Freiburg, Germany
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Shirai K, Dekura H, Masago A. Superconductivity research on boron solids and an efficient doping method. ACTA ACUST UNITED AC 2009. [DOI: 10.1088/1742-6596/176/1/012001] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Sato Y, Terauchi M, Kirihara K, Sasaki T, Kawaguchi K, Koshizaki N, Kimura K. Electron energy-loss and soft X-ray emission study of boron nanobelts. ACTA ACUST UNITED AC 2009. [DOI: 10.1088/1742-6596/176/1/012029] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Hayami W, Otani S. First-principles study of the electronic structures of α-rhombohedral boron codoped with lithium and oxygen. J SOLID STATE CHEM 2009. [DOI: 10.1016/j.jssc.2009.04.027] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Dekura H, Shirai K, Katayama-Yoshida H. Valence control of α-rhombohedral boron by electronic doping. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2007; 19:365241. [PMID: 21694186 DOI: 10.1088/0953-8984/19/36/365241] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
It was previously predicted that doping Li into semiconducting boron (α-rhombohedral) brought metallic character to the matrix and possibility a high-T(c) superconductor. However, experiments show that Li doping of α-rhombohedral boron is difficult. In this paper, the potential for Li doping of boron is re-examined using the ab initio pseudopotential method. Based on the calculated formation enthalpy, an efficient method for doping is proposed. The method utilizes high pressure, such as 10 GPa. Slight changes in the structural parameters for Li insertion are also resolved, which may be useful for the experimental detection of Li in boron. The stability of α-rhombohedral boron at high pressures is also compared to that of Ga-type structure, which has been put forth as a candidate for the high-pressure phase. The present study gives further confirmation of the stability of α-rhombohedral boron at least up to 70 GPa.
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Affiliation(s)
- Haruhiko Dekura
- Nanoscience and Nanotechnology Center, ISIR, Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan
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Adasch V, Hess KU, Ludwig T, Vojteer N, Hillebrecht H. Synthesis, crystal structure, and properties of two modifications of MgB(12)C(2). Chemistry 2007; 13:3450-8. [PMID: 17236227 DOI: 10.1002/chem.200601002] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Single crystals of two modifications of the new magnesium boride carbide MgB(12)C(2) were synthesized from the elements in a metallic melt by using tantalum ampoules. Crystals were characterized by single-crystal X-ray diffraction and electron microprobe analysis (energy-dispersive (EDX) and wavelength-dispersive (WDX) X-ray spectroscopy). Orthorhombic MgB(12)C(2) is formed in a Cu/Mg melt at 1873 K. The crystal structure of o-MgB(12)C(2) (Imma, Z=4, a=5.6133(10), b=9.828(2), c=7.9329(15) A, 574 reflections, 42 variables, R(1)(F)=0.0208, wR(2)(I)=0.0540) consists of a hexagonal primitive array of B(12) icosahedra with Mg atoms and C(2) units in trigonal-prismatic voids. Each icosahedron has six exohedral B--B and six B--C bonds. Carbon is tetrahedrally coordinated by three boron atoms and one carbon atom with a remarkably long C--C distance of 1.727 A. Monoclinic MgB(12)C(2) is formed in an Al/Mg melt at 1573 K. The structure of m-MgB(12)C(2) (C2/c, Z=4, a=7.2736(11), b=8.7768(13), c=7.2817(11) A, beta=105.33(3) degrees , 1585 reflections, 71 variables, R(1)(F)=0.0228, wR(2)(I)=0.0610) may be described as a distorted cubic close arrangement of B(12) icosahedra. Tetrahedral voids are filled by C atoms and octahedral voids are occupied by Mg atoms. The icosahedra are interconnected by four exohedral B--B bonds to linear chains and by eight interstitial C atoms to form a three-dimensional covalent network. Both compounds fulfill the electron-counting rules of Wade and Longuet-Higgins.
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Synthesis, crystal growth and structure of Mg containing β-rhombohedral boron: MgB17.4. J SOLID STATE CHEM 2006. [DOI: 10.1016/j.jssc.2006.03.009] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Vojteer N, Hillebrecht H. Li2B12C2 und LiB13C2: farblose borreiche Boridcarbide des Lithiums. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200502325] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Vojteer N, Hillebrecht H. Li2B12C2 and LiB13C2: Colorless Boron-Rich Boride Carbides of Lithium. Angew Chem Int Ed Engl 2006; 45:165-8. [PMID: 16304658 DOI: 10.1002/anie.200502325] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Natascha Vojteer
- Institut für Anorganische und Analytische Chemie, Albertstrasse 21, 79100 Freiburg, Germany
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Hayami W, Tanaka T, Otani S. Theoretical Study of the Stability of Lithium Atoms in α-Rhombohedral Boron. J Phys Chem A 2005; 109:11975-9. [PMID: 16366651 DOI: 10.1021/jp053031v] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The stability of lithium atoms in alpha-rhombohedral boron was investigated by first-principles calculations of total energies and molecular dynamics (MD) simulations. In the case of a low concentration (1.03 at. %), Li at the center of the icosahedral B12 site (the I-site) had a negative binding energy, which suggests Li at the I-site is unstable. However, MD simulations at temperatures below 750 K indicated that Li is still confined in the B12 cage under these conditions, which means Li at the I-site is metastable. Over 800 K, Li began to move away from the B12 site and settled at the tetrahedral site (the T-site) or at the octahedral site (the O-site). Li at the T-site also had a negative binding energy, but MD simulations indicated it was metastable up to 1400 K and did not move to other sites. Li at the O-site was energetically the most favorable, having a positive binding energy. In the case of a high concentration (7.69 at. %), the I-site changed to an unstable saddle point. At this concentration, the T-site was metastable and the O-site became the most stable. In MD simulations at 1400 K, Li atoms at the O-site never jumped to other sites regardless of concentration. Considering these facts, the diffusion coefficient of Li in alpha-rhombohedral boron would have to be very small below 1400 K.
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Affiliation(s)
- Wataru Hayami
- Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
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Masago A, Shirai K, Katayama-Yoshida H. The Pressure Dependence of Solid Boron. MOLECULAR SIMULATION 2004. [DOI: 10.1080/08927020412331298982] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Soga K, Oguri A, Araake S, Terauchi M, Fujiwara A, Kimura K. Li- and Mg-doping into icosahedral boron crystals, α- and β-rhombohedral boron, targeting high-temperature superconductivity: structure and electronic states. J SOLID STATE CHEM 2004. [DOI: 10.1016/j.jssc.2003.03.002] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Terauchi M, Tanaka M, Tsuno K, Ishida M. Development of a high energy resolution electron energy-loss spectroscopy microscope. J Microsc 1999; 194:203-209. [PMID: 10320554 DOI: 10.1046/j.1365-2818.1999.00450.x] [Citation(s) in RCA: 79] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
We have developed a high energy resolution electron energy-loss spectroscopy (EELS) microscope, which can take spectra from specified small specimen areas and specified small reciprocal space areas to investigate detailed electronic structures. The EELS microscope is equipped with retarding Wien filters as the monochromator and the analyser. The filters are designed to achieve a stigmatic focus. The energy resolutions are 12 meV and 25 meV for cases without and with a specimen, respectively. Spatial and momentum resolutions are 30-110 nm in diameter and 1.1 nm-1 in angular diameter, respectively. EELS spectra are presented to show the performance of this instrument.
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Affiliation(s)
- M Terauchi
- Research Institute for Scientific Measurements, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
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