Mo-Ru-Rh-Pd合金の酸化挙動の熱力学的評価 Thermodynamic Equilibrium Calculations on the Oxidation Behavior of the Mo-Ru-Rh-Pd Alloys

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  Thermodynamic equilibrium calculations using the FactSage program package were performed to investigate the oxidation behavior of a Mo-Ru-Rh-Pd alloy, which is well known as the undissolved residue in the reprocessing process. The influences of temperature, oxygen partial pressure, and Pd concentration on the equilibrium composition, melting temperature, and activities were evaluated. On the basis of the computed <i>T</i>-<i>P</i><sub><i>O</i><sub>2</sub></sub> phase diagram of Mo<sub>0.3</sub>Ru<sub>0.5</sub>Rh<sub>0.1</sub>Pd<sub>0.1</sub>, the stable compositions of Mo<sub>0.3</sub>Ru<sub>0.5</sub>Rh<sub>0.1</sub>Pd<sub>0.1</sub> under the conditions of a high-burnup UO<sub>2</sub> fuel and a glass melter were evaluated. The computed phase diagram showed that under an oxygen pressure of 0.2 Pa, RuO<sub>2</sub>, Rh<sub>2</sub>O<sub>3</sub>, the FCC phase, and MoO<sub>3</sub> (liquid or gas) are stable at <i>T</i>=1,000-1,200°C. The computed phase diagram also showed that precipitates in the glass provide information on the oxygen partial pressure and temperature of the glass in the melter. The computation of the phase diagram was also carried out for Mo<sub>0.3</sub>Ru<sub>0.5</sub>Pd<sub>0.2</sub>. The resultant phase diagram was compared with that of Mo<sub>0.3</sub>Ru<sub>0.5</sub>Rh<sub>0.1</sub>Pd<sub>0.1</sub> to investigate the effect of Pd concentration on the oxidation behavior of a Mo-Ru-Rh-Pd alloy. Based on the computed temperature-concentration phase diagram and activities of Mo, Ru, Rh, and Pd in the HCP phase, the effect of Pd concentration on the stability of each metallic species was discussed.<br>

収録刊行物

  • 日本原子力学会和文論文誌 = Transactions of the Atomic Energy Society of Japan

    日本原子力学会和文論文誌 = Transactions of the Atomic Energy Society of Japan 11(1), 30-36, 2012-03-01

    一般社団法人 日本原子力学会

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各種コード

  • NII論文ID(NAID)
    10030136545
  • NII書誌ID(NCID)
    AA11643165
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    13472879
  • NDL 記事登録ID
    023557332
  • NDL 請求記号
    Z74-C788
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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