Defect Control of Nickel Sulfide by Heat-Treatment in Sulfur Atmosphere

• Noda Yasutoshi

  Department of Materials Science, Faculty of Engineering, Tohoku University

• Ohtomo Shigekazu

  Graduate School, Tohoku University

• Igaki Kenzo

  Department of Materials Science, Faculty of Engineering, Tohoku University

• 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 Ni_1−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 Ni_1−xS phase, while in the ordered phase all the samples remain metallic at temperatures down to 4.2 K.

収録刊行物

• Transactions of the Japan Institute of Metals

  Transactions of the Japan Institute of Metals 20 (3), 89-99, 1979

  社団法人 日本金属学会

キーワード

• General Engineering

詳細情報

• CRID: 1390282680094454656
• NII論文ID: 130003485736
• DOI: 10.2320/matertrans1960.20.89
• COI: 1:CAS:528:DyaE1MXktVygt7g%3D
• ISSN: 24324701
• ISSN: 00214434
• Web Site: https://www.jstage.jst.go.jp/article/matertrans1960/20/3/20_3_89/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可