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http://hdl.handle.net/10119/4940
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| タイトル: | Li- and Mg-doping into Icosahedral Boron Crystals, α- and β- Rhombohedral Boron, Targeting High-Temperature Superconductivity: Structure and Electronic States |
| 著者: | Soga, Kohei
Oguri, Atsushi
Araake, Satoshi
Kimura, Kaoru
Terauchi, Masami
Fujiwara, Akihiko |
| 発行日: | 2004-02 |
| 出版者: | Elsevier |
| 誌名: | Journal of Solid State Chemistry |
| 巻: | 177 |
| 号: | 2 |
| 開始ページ: | 498 |
| 終了ページ: | 506 |
| DOI: | 10.1016/j.jssc.2003.03.002 |
| 抄録: | A possibility of high T_c superconductivity is suggested for lithium- and magnesium-doped icosahedral boron crystals, α- and β-rhombohedral boron. The doping of these elements were attempted by a vapor diffusion processing. Both of lithium and magnesium are hardly doped into the α-rhombohedral boron, though small amount of metallic parts were found in the sample. In only one sample, the metallic part contained 0.02 vol% of superconductive phase (T_C～36K). Magnesium was successfully doped into β-rhombohedral boron homogeneously up to 4 at% (Mg_<4.1>B_<105>), though considerable amount of impurity silicon was introduced together with magnesium. The structures of the doped samples were analyzed assuming co-doping of magnesium and silicon. The relation between the site occupancies of the dopants and the lattice expansion is discussed. The estimation of the density of states near the Fermi energy by EELS and magnetic susceptibility measurements suggested a metal transition of the β-rhombohedral boron by the doping of magnesium and silicon. The relation between the metal transition and the intrinsic accepter level is also discussed. |
| Rights: | NOTICE: This is the author’s version of a work accepted for publication by Elsevier.
Changes resulting from the publishing process, including peer review, editing, corrections,
structural formatting and other quality control mechanisms, may not be reflected in this
document. Changes may have been made to this work since it was submitted for publication.
A definitive version was subsequently published in Kohei Soga, Atsushi Oguri, Satoshi Araake, Masami Terauchi, Akihiko Fujiwara and Kaoru Kimura, Journal of Solid State Chemistry, 177(2), 2004, 498-506, http://dx.doi.org/10.1016/j.jssc.2003.03.002 |
| URI: | http://hdl.handle.net/10119/4940 |
| 資料タイプ: | author |
| 出現コレクション: | c10-1. 雑誌掲載論文 (Journal Articles)
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