层状钙钛矿化合物 (n-CnH2n+1NH3)2ZnCl4非等温固-固相变动力学的确定

确定了具有层状钙钛矿结构，脂肪链C原子数从12到18四氯合锌酸二烷基铵(C_nH_2n+1NH₃)₂ZnCl₄系列化合物的非等温固-固相变动力学。采用Kissinger和Ozawa两种动力学模型，对不同温度下测定的每个样品DSC热分析曲线进行数据处理，计算固-固相变过程的活化能E_a。实验结果表明，随着C原子数的增加，脂肪链的有序度和刚度降低，导致固-固相变活化能E_a随C原子数的增大而降低。两种模型方法的计算活化能E_a的结果相一致。并且各个化合物的固-固相变反应级数不随升温速率和烷基链长变化而变化，总保持为1。

Nonisothermal Kinetics of the Solid‐Solid Phase Transitions in the Perovskite Type Layer Compounds (CnH2n+1NH3)2ZnCl4

Nonisothermal kinetics of the solid‐solid phase transitions in the perovskite type layer compounds (C_nH_2n+1NH₃)₂ZnCl₄ has been determined for the hydrocarbon chain length from even number 12 to 18 of carbon atoms. The activation energy E_a was calculated by the Kissinger and Ozawa methods from the curves of Differential Scanning Calorimetry (DSC) measurements at different heating rates. The results indicated that the values of E_a of the phase transitions decreased with increasing chain length and showed a linear dependence on the number of carbon atoms, which was caused by that the order and rigidity of the hydrocarbon chain were decreased with increasing the carbon atoms. The two methods are in agreement with each other. The reaction order n of all materials is one that remains constant independently of the heating rate.