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贮热材料四氯合金属酸(Ⅱ)二烷基铵固-固相变动力学

Nonisothermal kinetics of solid-solid phase transitions in C₁₂Mn,C₁₄Mn and their binary system

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【Author】 WU Kezhong1,2),LI Jianling2),WANG xingdong2),LIU Xiaodi1)1)Department of Chemistry and Material Science,Hebei Normal University,Shijiazhuang 050016,China2)Metallurgical and Ecological Engineering School,University of Science and Technology Beijing,Beijing 100083,China

【机构】河北师范大学化学与材料科学学院；北京科技大学冶金与生态工程学院；河北师范大学化学与材料科学学院石家庄050016北京科技大学冶金与生态工程学院；北京100083；石家庄050016；

【摘要】热致相变贮热材料四卤合金属酸(Ⅱ)二烷基铵具有层状钙钛矿结构,通过晶型有序-无序转变能可逆地固-固相变贮热.合成了两种材料四氯合锰酸十二铵n-(C12H25NH3)2MnCl4和四氯合锰酸十四铵n-(C14H29NH3)2MnCl4,并在两种材料的乙醇溶液中结晶出一系列二元混合体系.对纯组分及各个二元体系利用差示扫描量热(DSC)测定了热分析曲线,采用Kissinger和Ozawa两种动力学模型研究了材料的非等温固-固相变动力学,计算了固-固相变过程的活化能和反应级数.两种方法的计算结果相一致.随着C12Mn质量分数的增加,二元体系表观活化能Ea值呈波动变化.CnMn及二元体系的反应级数均接近于1.更多还原

【Abstract】 Thermotropic phase transitions in the perovskite-type layer compounds n-(C12H25NH3)2MnCl4 and n-(C14H29NH3)2MnCl4 were synthesized and a series of their mixtures were prepared from ethanol solution.The nonisothermal kinetics of solid-solid phase transitions in C12Mn,C14Mn and their binary system was investigated by DSC.Kissinger and Ozawa methods were applied to determine the activation energy and reaction order of the solid-solid transitions,and the results of two methods are coincident.The value of activation energy Ea showed fluctuant with increasing XC12Mn.The reaction order of CnZn and their binary system is about 1.更多还原