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通过热重微分热重法(TG DTG)、差示扫描量热法(DSC)、X 射线衍射(XRD)技术研究了固态物质ZnC2O4·2H2O MgC2O4·2H2O机械混合物(摩尔比3∶1)在空气中热分解的过程.TG DTG的曲线表明,其热分解过程TG曲线中4个明显的台阶与理论失重相吻合;XRD结果表明样品在800 ℃煅烧时有较好晶型的MgxZn1-xO的生成.同时,用Ozawa法和Kissinger Akahira Sunose (KAS)法求取活化能Ea,用热分解动力学机理函数求算的比较法判断出可能的机理函数.ZnC2 O4 热分解的活化能分别为151.08 kJ/mol (Ozawa法)、147.73 kJ/mol(KAS法),MgC2O4热分解的活化能分别为164.17 kJ/mol(Ozawa法)、159.94kJ/mol(KAS法);ZnC2O4和MgC2O4热分解反应过程都遵循随机成核和随后生长型机理函数Am(Avrami Erofeer).
The mechanical properties of the solid ZnC2O4 · 2H2O MgC2O4 · 2H2O mechanical mixture (3: 1 molar ratio) were investigated by TG-TGG, DSC and XRD. TG DTG curve shows that the thermal decomposition process TG curve of four obvious steps consistent with the theoretical weight loss; XRD results show that the sample calcined at 800 ℃ have better crystalline MgxZn1-xO generation In the meantime, the activation energy Ea was determined by Ozawa method and Kissinger Akahira Sunose (KAS) method, and the possible mechanism function was determined by the comparison method calculated by the mechanism function of thermal decomposition kinetics.The activation energies of thermal decomposition of ZnC2O4 were 151.08 kJ (Ozawa method) and 147.73 kJ / mol (KAS method). The activation energies of thermal decomposition of MgC2O4 are 164.17 kJ / mol (Ozawa method) and 159.94 kJ / mol (KAS method) respectively. The thermal decomposition reaction processes of ZnC2O4 and MgC2O4 Following the random nucleation and growth mechanism function Am (Avrami Erofeer).