針状α-FeOOH粒子の生成に及ぼすコロイド母液の炭酸イオンの影響 Effect of Carbonate Ion in Colloidal Mother Liquid on Formation of Acicular α-FeOOH Particles

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The relationship between rate constant, activation energy for formation of acicular α-FeOOH particles and addition quantity of CO<SUB>3</SUB><SUP>2-</SUP> to colloidal mother liquid was discussed under the conditions: the pH and FeCl<SUB>3</SUB> concentration of mother liquid are constant 12.0-12.1 and 0.040-0.044 kmol/m<SUB>3</SUB> respectively. The rate constant decreased with increasing addition quantity of CO<SUB>3</SUB><SUP>2-</SUP>upto 0.25kmol/m<SUB>3</SUB>, and was constant over 0.25 kmol/m<SUP>3</SUP> for the aging at 80°C. At the temperature lower than 55°C, it did not show the dependence on CO<SUB>3</SUB><SUP>2-</SUP> concentration. Similarly, the activation energy decreased with increasing addition quantity of Co<SUB>3</SUB><SUP>2-</SUP>upto 0.25 kmol/m<SUP>3</SUP>, and further addition did not affect the activation energy. The observed dependence of the rate constant on the addition quantity of CO<SUB>3</SUB><SUP>2-</SUP>can be attributed to the following reason: the crystal growth of α-FeOOH is restrained by the adsorption of CO<SUB>3</SUB><SUP>2-</SUP> on the specified crystal plane. The fact that activation energy decreases with increasing addition quantity of CO<SUB>3</SUB><SUP>2-</SUP> indicates that recrystallization process of Fe(OH)<SUB>4</SUB><SUP>-</SUP> changes from the surface reaction controlled process to the diffusion controlled process. Both crystallite size and median diameter of acicular, α-FeOOH particles decreased with increasing addition quantity of CO<SUB>3</SUB><SUP>2-</SUP>. Both lengths of major axis and minor axis of acicular particles similarly decreased with increasing addition quantity of CO<SUB>3</SUB>2<SUP>-</SUP>. These dependencies indicate that the CO<SUB>3</SUB><SUP>2-</SUP> ions adsorb on the crystal planes homogeneously without any preference of the crystal planes among a, b, and c planes. This resulted in the decrease of dimension of the acicular α-FeOOH formed with similar aspect ratio.

収録刊行物

  • 粉体および粉末冶金

    粉体および粉末冶金 46(3), 247-251, 1999-03-15

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002262012
  • NII書誌ID(NCID)
    AN00222724
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    05328799
  • NDL 記事登録ID
    4690179
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-274
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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