中文摘要：

通过分析铁氧化物的分解反应热力学及其与铁氧化物的还原反应热力学之间的联系,得到了铁氧化物还原反应标准摩尔吉布斯自由能变化的更为合理的表达式,由此揭示了Fe2O3逐级还原顺序的起源。分析得出：Fe2O3的逐级还原顺序源自其分解顺序。铁氧化物的还原反应具有与其分解反应完全平行的热力学规律。以570℃为温度界限,铁氧化物各还原反应的摩尔吉布斯自由能变化值的大小顺序发生变化,导致各还原反应间的耦合模式也发生变化,从而产生Fe2O3的两种逐级还原顺序及Fe3O4的两种还原方式。

英文摘要：

More reasonable expressions for standard molar Gibbs free energy change of iron oxides reductions were obtained through conducting analysis on the decomposition thermodynamics of iron oxides,as well as on the correlation between decomposition thermodynamics and reduction thermodynamics,whereby the origin of the stepwise reduction sequence of Fe2O3 were revealed.The analysis showed that the stepwise reduction sequence of Fe2O3 stems from its decomposition sequence.The rules of the decomposition thermodynamics of iron oxides are completely parallel to its reduction thermodynamics.With 570 ℃ as the boundary temperature,the molar Gibbs free energy change of the iron oxides reductions varies in their magnitude sequence,resulting in the change of the coupling pattern of the reactions,and subsequently leads to the two different stepwise reduction sequences for Fe2O3,and two different reduction modes for Fe3O4.