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Influence of Co~2+, Cu~2+ and Cr~3+ ions on the formation of magnetite

机译:Co〜2 +,Cu〜2 +和Cr〜3 +离子对磁铁矿形成的影响

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The oxidation products of Fe(OH)_2 formed in the presence of Co~2+, Cu~2+ and Cr~3+ were charactrized by various means. Co~2+ and Cu~2+ produced pure Fe_3O_4 by inhibiting the gen- eration of α-FeOOH, whilst Cr~3+ promoted the α-FeOOH formation and interfered with the Fe_3O_4 formation. The Fe_3O_4 particles produced with Co~2+ exhibited high Fe~2+ content, elec- Trical conductivity and stability to oxidation. Mossbauer spectroscopy demonstrated that the Excess Fe~2+ replaced for Fe~3+ in B-sites of Fe_3O_4. A small quantity of metal Fe formed in Addition to Fe_3O_4 on adding Co~2+.
机译:通过多种方法表征了在Co〜2 +,Cu〜2 +和Cr〜3 +存在下形成的Fe(OH)_2的氧化产物。 Co〜2 +和Cu〜2 +通过抑制α-FeO​​OH的生成而产生纯Fe_3O_4,而Cr〜3 +促进了α-FeO​​OH的形成并干扰了Fe_3O_4的形成。由Co〜2 +生成的Fe_3O_4颗粒具有较高的Fe〜2 +含量,电导率和对氧化的稳定性。 Mossbauer光谱表明,Fe_3O_4的B位中过量的Fe〜2 +代替了Fe〜3 +。在添加Co〜2 +后,除了Fe_3O_4之外还形成了少量的金属Fe。

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