Enhancing thermal stability of a"-Fe16N2

• Project/Area Number: 25620186
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Inorganic industrial materials
• Research Institution: Kyoto University
• Principal Investigator: YAMAMOTO Shinpei 京都大学, 物質-細胞統合システム拠点, 助教 (20362395)
• Co-Investigator(Kenkyū-buntansha): MCNAMEE Cathy 信州大学, 繊維学部, 准教授 (40504551)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
• Keywords: iron nitride / thermal stability / 窒化鉄 / 熱安定性

Outline of Final Research Achievements

Enhancement of thermal stability of a”-Fe16N2 was studied by doping a third element which interacts strongly with nitrogen atoms. The doped a”-Fe16N2 samples were prepared in two steps; oxide-to-metal reduction in a H2 stream and subsequent metal-to-nitride conversion using an NH3 stream. We have succeeded in finding conditions to produce high purity gallium-doped a”-Fe16N2 samples (purities > 90%). Thermal stability of thus-formed samples was studied and found to be similar to that of non-doped samples (a”-Fe16N2).

Research Products

• [Journal Article] Orbital magnetic moment and coercivity of SiO2-coated FePt nanoparticles studied by x-ray magnetic circular dichroism (2014)
  • Author(s): Y. Takahashi, T. Kadono, V. R. Singh, V. K. Verma, K. Ishigami, G. Shibata, T. Harano, A. Fujimori, Y. Takeda, T. Okane, Y. Saito, H. Yamagami, S. Yamamoto, and M. Takano
  • Journal Title: Physical Review B Volume: 90 Issue: 2
  • DOI: 10.1103/physrevb.90.024423
  • Peer Reviewed
• [Journal Article] Stability of α”-Fe16N2 in hydrogenous atmospheres (2014)
  • Author(s): S. Yamamoto, R. Gallage, S. Isoda, Y. Ogata, Y. Kusano, N. Kobayashi, T. Ogawa, N. Hayashi, M. Takahashi, M. Takano
  • Journal Title: Chem. Comm. Volume: 50 Issue: 53 Pages: 7040-7043
  • DOI: 10.1039/c4cc01839g
  • NAID: 120005623276
  • Peer Reviewed
• [Journal Article] Quantitative understanding of thermal stability of α"-Fe_<16>N_2 (2013)
  • Author(s): S. Yamamoto, R. Gallage, Y. Ogata, Y. Kusano, N. Kobayashi, T. Ogawa, N. Hayashi, K. Kohara, M. Takahashi, and M. Takano
  • Journal Title: Chem. Commun Volume: 49(70) Issue: 70 Pages: 7708-7710
  • DOI: 10.1039/c3cc43590c
  • Peer Reviewed
• [Presentation] Quantitative understanding of thermal stability of a”-Fe16N2 (2014)
  • Author(s): Shinpei Yamamoto
  • Organizer: 59th Annual Magnetic and Magnetic Materials Conference
  • Place of Presentation: ホノルル
  • Year and Date: 2014-11-03 – 2014-11-07
• [Presentation] 強磁性窒化鉄a’’-Fe16N2の水素ガス雰囲気下における安定性 (2014)
  • Author(s): 2.山本真平
  • Organizer: 粉体粉末冶金協会H26年度秋季大会
  • Place of Presentation: 大阪大学コンベンションセンター
  • Year and Date: 2014-10-29 – 2014-10-31
• [Presentation] 水素ガス雰囲気下における&#61537;”-Fe16N2の安定性 (2014)
  • Author(s): 山本真平
  • Organizer: 日本磁気学会第38回学術講演会
  • Place of Presentation: 慶應義塾大学 日吉キャンパス
  • Year and Date: 2014-09-02 – 2014-09-05
• [Presentation] 強磁性窒化鉄a’’-Fe16N2の熱安定性に関する研究 (2013)
  • Author(s): 山本真平, 高野幹夫, Gallage Ruwan, 小林斉也, 緒方安伸, 小川智之, 高橋研
  • Organizer: 粉体粉末冶金協会平成25年度秋季大会
  • Place of Presentation: 名古屋