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  1. 400 金属材料研究所
  2. 東北大学研究所報告. A集, 物理学・化学・冶金学

A New Type of Long Period Superlattice with Hexagonal Symmetry in Au-Cd Alloys

http://hdl.handle.net/10097/27573
http://hdl.handle.net/10097/27573
c9f8c502-5a17-4376-a369-3727c8d4f5d7
名前 / ファイル ライセンス アクション
KJ00004197778.pdf KJ00004197778.pdf (67.9 kB)
Item type 紀要論文 / Departmental Bulletin Paper(1)
公開日 2008-05-02
タイトル
タイトル A New Type of Long Period Superlattice with Hexagonal Symmetry in Au-Cd Alloys
言語
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.

HIRABAYASHI, M.

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YAMAGUCHI, S.

× YAMAGUCHI, S.

YAMAGUCHI, S.

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HIRAGA, K.

× HIRAGA, K.

HIRAGA, K.

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INO, N.

× INO, N.

INO, N.

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SATO, H.

× SATO, H.

SATO, H.

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TOTH, R. S.

× TOTH, R. S.

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
ISSN
収録物識別子タイプ ISSN
収録物識別子 00408808
書誌レコードID
収録物識別子タイプ NCID
収録物識別子 AA00836167
フォーマット
内容記述タイプ Other
内容記述 application/pdf
著者版フラグ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
出版者
出版者 Tohoku University
資源タイプ
内容記述タイプ Other
内容記述 紀要類(bulletin)
登録日
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
フォーマット
内容記述タイプ Other
内容記述 67868 bytes
更新日
日付 2010-01-27
日付タイプ Created
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