摘要:
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:\[{\rm{dln}}{{\rm{\gamma}}_{\rm{A}}}{\rm{=-}}\frac{{{\rm{\Delta}}{{\rm{H}}_{\rm{f}}}^{\rm{0}}{{\rm{N}}_{\rm{B}}}}}{{{\rm{R}}{{\rm{T}}^{\rm{2}}}{\rm{(x}}{{\rm{N}}_{\rm{B}}}{\rm{-y}}{{\rm{N}}_{\rm{A}}}{\rm{)}}}}{\rm{dT-dln}}{{\rm{N}}_{\rm{A}}}\;\;\;\;\;\;\;\;(1)\]式中:ΔHf0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;NA、NB分别为组元A、B的摩尔分数;γA、γB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[3]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。
Abstract:
According to the method of activity calculation in binary system containing compounds from standard entropy of formation of compounds[1], further using the standard heat of fo rmationof compounds, we deduced the new formula which was also for the compound system. The new formula is\[{\rm{dln}}{{\rm{\gamma }}_{\rm{A}}}{\rm{= - }}\frac{{{\rm{\Delta }}{{\rm{H}}_{\rm{f}}}^{\rm{0}}{{\rm{N}}_{\rm{B}}}}}{{{\rm{R}}{{\rm{T}}^{\rm{2}}}{\rm{(x}}{{\rm{N}}_{\rm{B}}}{\rm{ - y}}{{\rm{N}}_{\rm{A}}}{\rm{)}}}}{\rm{dT - dln}}{{\rm{N}}_{\rm{A}}}\;\;\;\;\;\;\;\;(1)\]here ΔHf0 is standard heat of formation of compounds; x,y.is stoichi-ametric factors of the component A,B respectively; NA NB is mole fraction of the components A. B respectively; γA. γB is activity coefficient of components A,B at liquidus temperature.
In the binary system Au-B1 the activity values calculated by our fo-mula and by Chou's formula are compared with the measured values. They were very well in agreement on the values.
In this paper the values of the binary system Al-La is calculated using our new formula. The results are discussed briefly.
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