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- Noda Yasutoshi
- Department of Materials Science, Faculty of Engineering, Tohoku University
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- Ohtomo Shigekazu
- Graduate School, Tohoku University
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- Igaki Kenzo
- Department of Materials Science, Faculty of Engineering, Tohoku University
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- Holser William T.
- Visiting Scientist to Tohoku University
抄録
Heat-treatment in sulfur atmosphere can control the defect concentration in crystals in the Ni–S system. In the composition range of Ni1−xS, two different phases have been demonstrated, one of which takes a disordered structure and the other an ordered structure.<BR>The disordered phase has been found to have the NiAs-type structure with a partial ordering of vacancies. X-ray diffraction patterns of the ordered phase contain superlattice reflections corresponding to the hexagonal cell with dimensions a′=3a0 and c′=3c0 and streaks along the c* axis. Two superstructures belonging respectively to space groups P3121 and P3221, have been proposed, where vacancies are ordered corresponding to the composition Ni17S18. Electron diffraction investigation indicates that the domain size of each superstructure is larger than about 0.5 μm.<BR>Electric resistivity and magnetic susceptibility at the metal-semiconductor transition for the disordered phase showed hysteresis with tempetature cycling. The transition occurs only in the disordered Ni1−xS phase, while in the ordered phase all the samples remain metallic at temperatures down to 4.2 K.
収録刊行物
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- Transactions of the Japan Institute of Metals
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Transactions of the Japan Institute of Metals 20 (3), 89-99, 1979
社団法人 日本金属学会
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キーワード
詳細情報 詳細情報について
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- CRID
- 1390282680094454656
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- NII論文ID
- 130003485736
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- COI
- 1:CAS:528:DyaE1MXktVygt7g%3D
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- ISSN
- 24324701
- 00214434
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可