“活度”质疑

发布时间：2019-07-16 08:38

【摘要】：为研究二元系溶液中组元摩尔分数和气相中蒸气压的规律,考察了48个化合物在熔点固液相变的熔化熵变,发现相变时没有发生显著的化合物分解.在假设二元系溶液中存在化合物分子的情况下,组元在全浓度范围符合拉乌尔定律,不存在Lewis定义的"活度";通过与Mg-Si、In-Sb和Fe-Mn三个二元系实测活度结果对比,证实了计算的平衡摩尔分数即为活度值,二元金属熔体不存在所谓"活度"的观点.推导了在二元系金属熔体存在一个金属间化合物条件下平衡的摩尔分数的通用公式,以及相应的A_2B或AB型金属间化合物的一般公式.将二元系溶液划分为大于纯组元熔点的温度、小于纯组元熔点温度但高于液相线和低于液相线的三个区间,提出了适应不同区间的广义拉乌尔定律的关系式.
[Abstract]:In order to study the mole fraction of components in binary solution and vapor pressure in gas phase, the melting entropy change of solid-liquid phase transition of 48 compounds at melting point was investigated. It was found that no significant decomposition of compounds occurred during the phase transition. Under the assumption that there are compound molecules in binary system solution, the component obeys Raul's law in the range of full concentration, and there is no "activity" defined by Lewis. By comparing with the measured activity results of Mg-Si,In-Sb and Fe-Mn ternary systems, it is confirmed that the calculated equilibrium mole fraction is the activity value and that there is no so-called "activity" in binary metal melts. The general formula of equilibrium mole fraction in binary melt and the general formula of A 鈮，

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