(Zn1-xMnx)C2O4·2H2O在空气中的热分解动力学研究

用热分析（TG-DTG/DTA）、X射线衍射（XRD）技术和透射电镜（TEM）研究了固态物质Zn_1-xMn_xC₂O₄•2H₂O在空气中热分解的过程。热分析结果表明，Zn_1-xMn_xC₂O₄•2H₂O在空气中分两步分解，其失重率与理论计算失重率相吻合。 XRD和TEM结果表明，Zn_1-xMn_xC₂O₄•2H₂O分解的最终产物为Zn_1-xMn_xO,其颗粒大小约为10-13nm。在非等温条件下对Zn_1-xMn_xC₂O₄•2H₂O的热分解动力学进行了分析。用Friedman法和Flynn-Wall-Ozawa(FWO)法求取了分解过程的活化能E，并用多元线性回归给出了可能的机理函数。Zn_1-xMn_xC₂O₄•2H₂O两步热分解的活化能分别为155.7513 kJ/mol 和215.9397 kJ/mol。

Kinetics of Thermal Decomposition of Zn1–xMnxC2O4·2H2O in Air

Thermal decomposition processes taking place in solid state complex of Zn_1?xMn_xC₂O₄·2H₂O have been investigated in air using TG‐DTG/DTA, XRD and TEM techniques. TG‐DTG/DTA curves showed that the decomposition proceeded through two well‐defined steps with DTA peaks closely to correspond to the weight loss. XRD and TEM showed that the final decomposition product of Zn_1–xMn_xC₂O₄·2H₂O was Zn_1–xMn_xO and most of the individual particles were of size 10–13 nm. Kinetics analysis of Zn_1–xMn_xC₂O₄·2H₂O decomposition steps was performed under nonisothermal conditions, the activation energies were estimated by Friedman and Flynn‐Wall‐Ozawa (FWO) methods, and the most probable kinetic model has been estimated with multiple linear regression method. The activation energies for the two decomposition steps of Zn_1–xMn_xC₂O₄·2H₂O were 155.7513 and 215.9397 kJ/mol, respectively.