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本文对PbI2合成反应体系的反应焓变,反应熵增,Gibbs自由能变化和反应平衡常数进行了理论计算,从热力学角度论证了选取PbI2熔点(678K)以上的723K作为体系合成反应控制温度的可行性。在723K的控温工艺下,采用两温区气相输运方法合成出高纯、单相的PbI2多晶材料,XRD分析结果表明符合热力学计算结果的控温工艺能有效地应用于PbI多晶合成。
In this paper, the enthalpy change, reaction entropy increase, Gibbs free energy change and reaction equilibrium constant of PbI2 synthesis reaction system were theoretically calculated. From the thermodynamic point of view, it was demonstrated that the temperature 723K above the melting point of PbI2 (678K) Sex. Under the temperature control of 723K, PbI2 polycrystalline materials with high purity and single phase were synthesized by vapor phase transport in two temperature zones. The results of XRD showed that the temperature-controlled process accorded with thermodynamic calculation could be effectively applied to the synthesis of PbI polycrystalline .