Structure and Magnetic properties of Mechanically Grinded γ′-Fe4N Iron Nitride (メカニカルアロイング<特集>)
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概要
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We have studied the structure and magnetic properties of mechanically grinded γ-Fe<SUB>4</SUB>N iron nitride powder. During mechanical grinding (MG), γ-Fe<SUB>4</SUB>N iron nitride initially changes to a bcc structure where the phase transformation is not completed. After 100h of MG, an amorphous-like phase is partially formed. Saturation magnetization (σ) and coercive force (Hc) improve due to the structure change of γ-Fe<SUB>4</SUB>N and worsen with further MG. In the milled alloy of 300 h, α-Fe, γ-Fe<SUB>4</SUB>N and α"-Fe<SUB>16</SUB>N<SUB>2</SUB> phases appear after annealing at 673K, leading to the increase of saturation magnetization. However, after annealing above 873K, only α-Fe is retained owing to the vaporization of nitrogen atoms from Fe matrix.
- 社団法人 粉体粉末冶金協会の論文
著者
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ONODERA Hideya
Institute for Materials Research, Tohoku University
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Onodera Hideya
Institute For Materials Research
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Suzuki Kenji
Institute For Material Resezrch Tohoku University
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Kim K‐j
Pohang Univ. Sci. And Technol. Kyungbuk Kor
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Sumiyama Kenji
Institute For Materials Research Tohoku University
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Kim Kyu-jin
Institute For Materials Research Tohoku University
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Suzuki Kenji
Institute For Masterials Research Tohoku University
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Kim Kyu-Jin
Institute for Materials Research, Tohoku University
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