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A New Type of Long Period Superlattice with Hexagonal Symmetry in Au-Cd Alloys
http://hdl.handle.net/10097/27573
http://hdl.handle.net/10097/27573c9f8c502-5a17-4376-a369-3727c8d4f5d7
名前 / ファイル | ライセンス | アクション |
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Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||||||||||||||
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公開日 | 2008-05-02 | |||||||||||||||||
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タイトル | A New Type of Long Period Superlattice with Hexagonal Symmetry in Au-Cd Alloys | |||||||||||||||||
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言語 | eng | |||||||||||||||||
資源タイプ | ||||||||||||||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||||||||||||
資源タイプ | departmental bulletin paper | |||||||||||||||||
著者 |
HIRABAYASHI, M.
× HIRABAYASHI, M.
× YAMAGUCHI, S.
× HIRAGA, K.
× INO, N.
× SATO, H.
× TOTH, R. S.
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抄録 | ||||||||||||||||||
内容記述タイプ | Abstract | |||||||||||||||||
内容記述 | The existence of a new type of long period superlattice having hexagonal symmetry, whose period is determined by the critical contact of the Brillouin zone boundaries with the Fermi surface, has been established. The ordering of the atoms on the close packed hexagonal plane of these structures is derived from that of the A_3B type (Cu_3Au type) structure, but the long period is produced in the basal plane by the existence of antiphase boundaries in three directions perpendicular to the close packed plane and making 120° with each other, thus creating the hexagonal symmetry. The stacking of the close packed layers is of either the 2H or 4H type. The size of this hexagonal unit cell is found to be between seven and nine times as large as that of the hexagonal unit cell of the disordered close packed lattice, these limiting cases being called the 7a_0 structure and the 9a_0 structure respectively. Significantly, the period of this structure is found to respond to a change of e/a in a fashion similar to that found in the one dimensional long period superlattice, which has been investigated in detail. In the case of the Au-Cd alloys, the stacking is of the 2H type and the 7a_0 structure is identified as Au_<72>Cd_<26> with space group P6_3/mmc, and the 9a_0 structure as Au_<42>Cd_<12> with P6_3/mcm. The geometry of the Brillouin zone structure indicates that the structure is stabilized by creating superlattice Brillouin zone boundaries at the flat part of the Fermi surface (in the <110> directions in the case of the fcc structure), as in the case of the one dimensional long period superlattice. Examples of these new structures are found, other than in the Au-Cd alloys reported here, in Au-Mg alloys, Cu-Sb alloys, etc. near the A_3B composition range. These structures are usually found among the long period stacking variants of a one dimensional long period superlattice with non variable period (M=1, M=2, etc.), occurring in these alloys. | |||||||||||||||||
書誌情報 |
Science reports of the Research Institutes, Tohoku University. Ser. A, Physics, chemistry and metallurgy 巻 23, p. 48-48, 発行日 1971 |
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収録物識別子タイプ | ISSN | |||||||||||||||||
収録物識別子 | 00408808 | |||||||||||||||||
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収録物識別子タイプ | NCID | |||||||||||||||||
収録物識別子 | AA00836167 | |||||||||||||||||
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内容記述タイプ | Other | |||||||||||||||||
内容記述 | application/pdf | |||||||||||||||||
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出版タイプ | VoR | |||||||||||||||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||||||||||||
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出版者 | Tohoku University | |||||||||||||||||
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内容記述タイプ | Other | |||||||||||||||||
内容記述 | 紀要類(bulletin) | |||||||||||||||||
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日付 | 2008-05-02 | |||||||||||||||||
日付タイプ | Created | |||||||||||||||||
公開日(投稿完了日) | ||||||||||||||||||
日付 | 2008-05-02 | |||||||||||||||||
日付タイプ | Created | |||||||||||||||||
発行日 | ||||||||||||||||||
日付 | 1971 | |||||||||||||||||
日付タイプ | Created | |||||||||||||||||
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内容記述タイプ | Other | |||||||||||||||||
内容記述 | 67868 bytes | |||||||||||||||||
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日付 | 2010-01-27 | |||||||||||||||||
日付タイプ | Created |