摘要
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。
The molar enthalpy change, the molar entropy increase, the Gibbs free energy and the balance constant of PbI2 polycrystal synthesis reaction were calculated in this paper.Based on the thermodynamics analysis,the feasibility of controlling synthesis reaction temperature on 723K upon the melting point （678K） of PbI2 was discussed also.Through the craft controlling on 723K,highly pure and single phase PbI2 polycrystal was synthesized by two temperature vapor transporting method （TVM）.The result of XRD analysis indicates the temperature controlling craft accordant with thermodynamics calculating which can be used for PbI2 polycrystal synthesis effectively.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2007年第5期1017-1021,共5页
Journal of Synthetic Crystals
关键词
PbI2
多晶合成
热力学
控温工艺
PbI2
polycrystal synthesis
thermodynamics
temperature controlling craft
