High-resolution neutron powder diffraction study on nitrogenated Nd2Fe17

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  • Tsuyoshi Kajitani
    Institute for Materials Research, Tohuku University, Sendai 980, Japan
  • Yukio Morii
    Department of Physics, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-11, Japan
  • Satoru Funahashi
    Department of Physics, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-11, Japan
  • Takahiko Iriyama
    Central Laboratory, Asahi Chemical Industry Co. Ltd., Fuji, Shizuoka 416, Japan
  • Kurima Kobayashi
    Central Laboratory, Asahi Chemical Industry Co. Ltd., Fuji, Shizuoka 416, Japan
  • Hiroaki Kato
    Institute for Materials Research, Tohuku University, Sendai 980, Japan
  • Yasuaki Nakagawa
    Institute for Materials Research, Tohuku University, Sendai 980, Japan
  • Kenji Hiraya
    Institute for Materials Research, Tohuku University, Sendai 980, Japan

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<jats:p>High-resolution neutron powder diffraction measurements with λ=1.8232 Å and collimation of 6′-20′-6′ on Nd2Fe17Nx with x=0, 2.85, and 2.91 were carried out at room temperature. Structural parameters and magnetic moments were determined by the Rietveld profile-fitting calculation. The magnetic moments of iron atoms increased with increasing nitrogen concentration; e.g., the magnetic moments of iron located at 6c, 9d, 18f, and 18h sites increase from less than 0.7μB in the x=0 sample to about 2.1μB in the x=2.91 sample. It is noticed that a local atomic group composed of two Fe(1) atoms at the 6c site plus six Fe(3) atoms at the 18f site keeps its shape against the nitrogen uptake.</jats:p>

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