Solid State Electrotransport of Oxygen in Neodymium.

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  • SANO Hiroyuki
    Graduate School of Engineering, Nagoya University, Chikusa–ku, Nagoya 464–8603
  • YOSHIDA Takayuki
    Graduate School of Engineering, Nagoya University, Chikusa–ku, Nagoya 464–8603
  • KURODA Kensuke
    Center for Integrated Research in Science and Engineering, Nagoya University
  • FUJISAWA Toshiharu
    Research Center for Advanced Waste and Emission Management, Nagoya University
  • YAMAUCHI Chikabumi
    Graduate School of Engineering, Nagoya University, Chikusa–ku, Nagoya 464–8603

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Other Title
  • ネオジム中の酸素の固相エレクトロトランスポート
  • ネオジム チュウ ノ サンソ ノ コソウ エレクトロトランスポート

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Abstract

Solid state electrotransport of oxygen in neodymium was studied. The effective valence Z* and the non-dimensional number δ (= uEL/D；u：mobility, E：electric field intensity, L：length of specimen, D：diffu-sion coefficient) of oxygen were measured by the tangent method under the following conditions；electric field intensity = 1.9∼2.5 Vm-1, temperature = 973∼1,223 K, initial oxygen content = 0.01∼0.11 mass %. The results can be summarized as follows： (i) The absolute values of the effective valence and δ of oxygen decrease with increasing either electric field intensity or temperature. (ii) The diffusion coefficient of oxygen in neodymium was determined as follows：DO /m2 s-1 = 0.26 exp (-196000/RT) (Nd(α)：973 ∼ 1,073 K)DO /m2 s-1 = 1.6 × 10-2 exp (-180000/RT) (Nd(β)：1,173 ∼ 1,223 K) (iii)Mobility of oxygen in neodymium increased with increasing temperature.

Journal

  • Shigen-to-Sozai

    Shigen-to-Sozai 115 (1), 54-58, 1999

    The Mining and Materials Processing Institute of Japan

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