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首页> 外文期刊>Physica, B. Condensed Matter >Physicochemical properties of liquid Ag-Bi-Sn
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Physicochemical properties of liquid Ag-Bi-Sn

机译：液态Ag-Bi-Sn的理化性质

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Free energies of mixing in liquid Ag-Bi-Sn are deduced from EMF measurements. The excess free energy was found to adopt negative values near the Ag-rich corner, whereas positive values are the dominant feature towards the Bi-Sn side of the ternary system. The section with the constant atomic fraction ratio of c(Ag/)c(Bi) = 2 marks the tentative borderline between the two regimes. The surface tension and the surface concentrations of the liquid system were calculated with the help of the experimental thermodynamic activity coefficients. The results indicate a preferential segregation of Bi and Sn atoms into the surface layer. Excepting the Ag-rich corner of the system (c(Ag) > 0.9), the surface is only scarcely populated by Ag atoms. Up to composition ratios of c(Ag)/c(Bi)approximate to 2 the surface concentration of Ag is found to be less than 1 at%. As a consequence, over a wide range of the ternary system, the surface tension is not very different from the value of pure Bi or Sn. The calculated viscosity is indicated to be primarily dependent on the concentration of Ag, whereas the substitution of Bi by Sn at a constant concentration of Ag yields only small changes. Due to their close correlation with the free energy of mixing, the viscosities show positive deviations from ideality for alloys with c(Ag/)c(Bi) < 2 and negative deviations if c(Ag/)c(Bi) > 2. (c) 2006 Elsevier B.V. All rights reserved.
机译：液态Ag-Bi-Sn中混合的自由能由EMF测量得出。发现过量的自由能在富银角附近采用负值，而正值是三元系Bi-Sn侧的主要特征。原子分数比恒定的c（Ag /）c（Bi）= 2的部分标志着这两种状态之间的暂时性边界。借助实验热力学活性系数计算出液体系统的表面张力和表面浓度。结果表明Bi和Sn原子优先偏析到表面层中。除了系统中富含Ag的角（c（Ag）> 0.9）之外，表面几乎没有Ag原子。直至c（Ag）/ c（Bi）的组成比接近于2，发现Ag的表面浓度小于1at％。结果，在三元体系的宽范围内，表面张力与纯Bi或Sn的值差别不大。表明计算出的粘度主要取决于Ag的浓度，而在恒定的Ag浓度下用Sn取代Bi只会产生很小的变化。由于它们与混合自由能密切相关，因此对于c（Ag /）c（Bi）<2的合金，粘度显示出与理想值的正偏差，而如果c（Ag /）c（Bi）> 2则显示出负值。 c）2006 Elsevier BV保留所有权利。

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