Thermal decomposition of ammonium hexafluoroaluminate and preparation of aluminum fluoride
Thermal decomposition of ammonium hexafluoroaluminate and preparation of aluminum fluoride
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DOI：
10.1016/s1003-6326(11)60977-1
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发表时间：
2011-09-01
影响因子：
4.5
通讯作者：
Wang Zhao-wen
中科院分区：
文献类型：
--
作者：
Hu Xian-wei;Li Lin;Wang Zhao-wen
The thermal decomposition process of (NH(4))(3)AlF(6) was studied by DTA-TGA method and the related thermodynamic data were obtained. The results show that AlF(3) is obtained after three-step decomposition reaction of (NH(4))(3)AlF(6), and the solid products of the first two decomposition reactions are NH(4)AlF(4) and AlF(3)(NH(4)F)(0.69), respectively. The three reactions occur at 194.9, 222.5 and 258.4 degrees C, respectively. Gibbs free energy changes of pertinent materials at the reaction temperatures were calculated. Enthalpy and entropy changes of the three reactions were analyzed by DSC method. Anhydrous aluminum fluoride was prepared. The XRD analysis and mass loss calculation show that AlF(3) with high purity can be obtained by heating (NH(4))(3)AlF(6) at 400 degrees C for 3 h.
