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本文研究了1550～1670℃温度范围内Fe-Sn-Ce溶液体系的热力学性质。在溶液中存在微量铈、氧、锡、硫条件下,未发现铈与锡的金属间化合物,而是铈与氧硫建立平衡。求得反应Ce_2O_2S=2[Ce]+2[O]+[S]的平衡常数及Ce_2O_2S的标准生成自由能。铈与锡的一阶、二阶相互作用系数与温度的关系式分别为:lgK=-29420/T+1.58;ΔG°=-563150+30.24T;e_(Sn)~(Ce)=95889/T+48.50T;γ_(Sn)~(Ce)=21132/T-10.44。
In this paper, the thermodynamic properties of the Fe-Sn-Ce solution system at 1550 ~ 1670 ℃ were studied. In the presence of trace amounts of cerium, oxygen, tin and sulfur in the solution, no intermetallic compounds of cerium and tin were found, but the balance of cerium and oxysulfide was established. The equilibrium constant of Ce 2 O 2 S = 2 [Ce] +2 [O] + [S] and the standard free energy of formation of Ce 2 O 2 S were obtained. The relationship between the first-order and second-order interaction coefficients of cerium and tin is: lgK = -29420 / T + 1.58; ΔG ° = -563150 + 30.24T; e_ (Sn) ~ (Ce) = 95889 / T + 48.50T; γ_ (Sn) ~ (Ce) = 21132 / T-10.44.