用AIF_6~(3-)络合离子逐级分解模式和亚晶格溶液模型计算了LiF-AlF_3熔体中AlF_6~(3-)逐级分解常数和分解能分解常数依次为K_1=1.6×10~(-1),K_2=1.02,K_3=8.0×10~(-2);分解能为H_1=25.7kJ/mol,H_2=30.0kJ/mol,H_3=63.6kJ/mol计算表明,LiF-AlF_3熔体中的络合离子AlF_6~(3-)较其他碱金属冰晶石体系中的AlF_6~(3-)有更强的分解趋势和较小的分解能本文还计算了LiF-AlF_3熔体中各组成的摩尔浓度及其它溶液混合热力学量,计算结果与实验值吻合较好
The dissociation model of complex ion, combined with the sublattice solutionmodel is applied to calculate constants and heats of dissociation successively of complex ionAlF_6~(3-). The results show that AlF_6~(3-)in LiF-AlF_3 melt has a stronger tendency todissociation and smaller heats of dissociation than that in other alkali fluoride and the alumi-num fluoride system. The molar concentration of each composition in LiF-AlF_3 melts arecalculated, and the thermodynamic properties of mixing for LiF(l) and AlF_3(s) are calculatedas well. The results of calculation agree with experimental results.
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