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本文利用已知化合物的生成热,推导出了一个在含有化合物的二元体系,由相图计算活度的新公式: 式中:ΔHf~0为化合物的标准生成热;x,y分别为化合物的化学计量系数;N_A、N_B分别为组元A、B的摩尔分数;γ_A、γ_B分别为组元A、B在液相线温度时的活度系数。 对已知活度值的Au—Bi二元体系,用文献中公式及我们的公式进行了计算,其计算数值与实验数值符合较好,证实了用本公计算含有化合物的二元体系的活度是可行的。 我们用本公式计算了Al—La二元体系的活度,对预报的结果进行了初步分析。
In this paper, we derive a new formula for calculating the activity from the phase diagram of a binary system containing compounds by using the heat of formation of known compounds: where: ΔHf ~ 0 is the standard heat of formation of the compound; and x and y are the compounds ; N_A, N_B are the mole fractions of the components A and B, respectively; and γ_A and γ_B are respectively the activity coefficients of the components A and B at the liquidus temperature. For the Au-Bi binary system with known activity values, the formula in the literature and our formula were used. The calculated values agree well with the experimental data, confirming that the binary system containing compounds Degree is feasible. We calculated the activity of Al-La binary system by this formula, and carried on the preliminary analysis to the prediction result.