机械化学法获得单相Fe3O4颗粒的热力学条件

为了给采用机械化学法从Fe₂O₃或粗粒Fe₃O₄获得单相Fe₃O₄纳米颗粒提供理论参考，探讨了机械力储能对铁氧化物机械化学反应热力学的影响规律。结果表明，在空气中，铁氧化物的机械化学分解温度随储能的增加而线性下降，导致反应体系中的各物相在热力学上稳定存在的温度范围发生变化。据此，在储能-温度坐标系上确定了以Fe₂O₃或Fe₃O₄为起始反应物的机械化学反应体系中期望物相Fe₃O₄的热力学稳定区，从而得出了获得单相Fe₃O₄颗粒的热力学条件。

Thermodynamic Condition for Preparation of Single Phase of Fe3O4 Particle Using Mechanochemical Method

With the purpose of giving theoretical insight for preparation of single phase of Fe₃O₄ particles from Fe₃O₄ or coarse Fe₃O₄ using mechanochemical method, the impact of stored energy on the thermodynamics of the mechanochemical reaction of iron oxides was discussed. Results showed that the mechanochemical decomposition temperature of iron oxides in air decreases linearly with the increase of stored energy, and subsequently the phases in the reaction system changes within the temperature ranges in thermodynamically stable. On these ground, the thermodynamically stable region for Fe₃O₄ in the mechanochemical reaction system with Fe₃O₄ (or Fe₃O₄) as the starting reactant were drawn in the stored energy-temperature coordinate system, and thereby the thermodynamic condition for preparation of single phase of Fe₃O₄ from either Fe₃O₄ or Fe₃O₄ were clarified.