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貯熱材料四氯合金屬酸(Ⅱ)二烷基銨固-固相變動力學

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

  • 摘要: 熱致相變貯熱材料四鹵合金屬酸(Ⅱ)二烷基銨具有層狀鈣鈦礦結構,通過晶型有序-無序轉變能可逆地固-固相變貯熱.合成了兩種材料四氯合錳酸十二銨n-(C12H25NH3)2MnCl4和四氯合錳酸十四銨n-(C14H29NH3)2MnCl4,并在兩種材料的乙醇溶液中結晶出一系列二元混合體系.對純組分及各個二元體系利用差示掃描量熱(DSC)測定了熱分析曲線,采用Kissinger和Ozawa兩種動力學模型研究了材料的非等溫固-固相變動力學,計算了固-固相變過程的活化能和反應級數.兩種方法的計算結果相一致.隨著C12Mn質量分數的增加,二元體系表觀活化能Ea值呈波動變化.CnMn及二元體系的反應級數均接近于1.

     

    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.

     

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