The formation of Mg-bearing ferrite by the air oxidation of aqueous suspensions.
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概要
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When the Mg<SUP>2+</SUP>/Fe<SUB>total</SUB> molar ratio in the initial aqueous suspension is below 0.1 at pH 9.0 and 65 °C, almost all Mg<SUP>2+</SUP> is incorporated into the spinel type ferrite by the air oxidation of Fe(OH)<SUB>2</SUB>. The chemical composition of the Mg-bearing ferrite thus obtained is not stoichiometric, and is expressed as the MgFe<SUB>2</SUB>O<SUB>4</SUB>–Fe<SUB>3</SUB>O<SUB>4</SUB>–γ-Fe<SUB>2</SUB>O<SUB>3</SUB>system. When the Mg<SUP>2+</SUP>/Fe<SUB>total</SUB> ratio exceeds 0.1, the excess Mg<SUP>2+</SUP> produces a basic magnesium sulfate which has a composition of [Mg<SUB>1.00</SUB><SUP>2+</SUP>, Na<SUB>0.64</SUB><SUP>+</SUP>] [OH<SUB>1.36</SUB><SUP>−</SUP>,(SO<SUB>4</SUB><SUP>2−</SUP>)<SUB>0.64</SUB>]. At pH 8.0, a small amount of the Mg<SUP>2+</SUP> is incorporated into the ferrite, between pH 9.0 and 10.0 only the Mg-bearing ferrite is formed, and at pH 11.0, the α-FeOOH type compound is formed together with the Mg-bearing ferrite.
- 公益社団法人 日本化学会の論文
著者
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KATSURA Takashi
Department of Chemistry
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Kaneko Ken
Department of Chemistry, Tokyo Institute of Technology
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