The paper addresses the measurement of the partial molar Gibbs energy (\(\Delta {\stackrel{-}{G}}_{Bi},\Delta {\stackrel{-}{G}}_{Sn}\)), thermodynamic activity (\({a}_{Bi},{a}_{Sn}\)) and the activity coefficient (\({\gamma }_{Bi ,}{\gamma }_{Sn}\)) of the Bi-Sn binary system at 600 and 903 K. The experiments were carried out in an H-shaped electrochemical cell based on the measurement of electromotive force with the reversible electrode–solid electrolyte. The measuring electrode was made of Bi_x-Sn_1−x alloys with x ranging from 0.1 to 0.9, step 0.1. The reference electrode was manufactured from pure bismuth, while the electrolyte was a mixture of 17% moles KCl and 83% moles SnCl₂ (selected because it contains free ions Sn and the melting temperature of the electrolyte (563 K). To obtain reliable experimental data, each measurement was repeated five times and the standard deviation/error was calculated. Based on error propagation law, the mathematical expression of the compound uncertainty for each quantity addressed in the paper was derived. An innovative derivation is presented for the compound uncertainty (u_c) of γ_Sn. The values of the \(\Delta {\stackrel{-}{G}}_{Bi},\Delta {\stackrel{-}{G}}_{Sn}\), a_Bi, a_Sn, γ_Bi and γ_Sn are accompanied by their expanded uncertainty having a 95% confidence level. The novelties addressed in the paper are the values of ΔG_Bi, ΔG_Sn, a_Bi, a_Sn, γ_Bi and γ_Sn in the Bi-Sn binary system at 600 and 903 K.

本文介绍了部分摩尔Gibbs能量（\（\ Delta {\ stackrel {-} {G}} _ {Bi}，\ Delta {\ stackrel {-} {G}} _ {Sn} \）的测量） ，热力学活动（\（{a} _ {Bi}，{a} _ {Sn} \））和活动系数（\（{\ gamma} _ {Bi，} {\ gamma} _ {Sn} \））在600和903 K的Bi-Sn二元系统中进行。实验是在H型电化学电池中进行的，该电池基于可逆电极-固体电解质对电动势的测量。测量电极由Bi _x -Sn _{1- x}合金和x制成范围从0.1到0.9，步长为0.1。参比电极由纯铋制成，而电解质是17％摩尔KCl和83％摩尔SnCl ₂的混合物（之所以选择，是因为它含有游离离子Sn和电解质的熔化温度（563 K）。为了获得可靠的实验结果数据，每次测量重复五次，并计算标准偏差/误差。根据误差传播定律，推导了本文针对每个量的复合不确定度的数学表达式。对复合不确定度提出了创新的推导（Ù _ç的）γ_的Sn。所述的值\（\德尔塔{\ stackrel { - } {G}} _ {毕}，\德尔塔{\ stackrel { - } {G}} _ {锡} \） ，一个_毕，一个_锡，γ_铋和γ_锡都伴随有95％的置信水平的扩展不确定度。新奇在纸张处理是的值ΔG_铋，ΔG_的Sn中，_铋，一个_锡，γ_铋和γ_的Sn中，在600和903 K.铋-锡二元体系