【摘要】：為研究二元系溶液中組元摩爾分數(shù)和氣相中蒸氣壓的規(guī)律,考察了48個化合物在熔點固液相變的熔化熵變,發(fā)現(xiàn)相變時沒有發(fā)生顯著的化合物分解.在假設(shè)二元系溶液中存在化合物分子的情況下,組元在全濃度范圍符合拉烏爾定律,不存在Lewis定義的"活度";通過與Mg-Si、In-Sb和Fe-Mn三個二元系實測活度結(jié)果對比,證實了計算的平衡摩爾分數(shù)即為活度值,二元金屬熔體不存在所謂"活度"的觀點.推導(dǎo)了在二元系金屬熔體存在一個金屬間化合物條件下平衡的摩爾分數(shù)的通用公式,以及相應(yīng)的A_2B或AB型金屬間化合物的一般公式.將二元系溶液劃分為大于純組元熔點的溫度、小于純組元熔點溫度但高于液相線和低于液相線的三個區(qū)間,提出了適應(yīng)不同區(qū)間的廣義拉烏爾定律的關(guān)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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