多组分体系相图中的杠杆原理形式  

The Forms of Lever Rule in the Phase Diagram of Multi-component Systems

作　　者：韦美菊[1] 陈飞武[1] 李旭琴[1] 叶亚平[1] 袁文霞[1] 

机构地区：[1]北京科技大学化学与生物工程学院,北京100083

出　　处：《大学化学》2016年第5期73-77,共5页University Chemistry

基　　金：北京科技大学研究型示范教学项目;MOOC课程示范项目

摘　　要：讨论了两相和三相多组分体系中杠杆原理的两种形式。对两组分体系,利用三相线上的杠杆原理关系式和凝固点降低公式,解释了熔化物体系冷却过程中的步冷曲线。另外,还讨论了三组分体系相图中,同一直线段上三个物系点之间的类杠杆原理关系式。该关系式可以用于不同浓度溶液的配制和三相体系相图的绘制。Two forms of the lever rule in the two-phase and three-phase regions of a multi-component system are discussed in this article. As for the two-component system, the cooling curves of solutions are explained with the lever rule in a three-phase line and the freezing point depression equation. A similar form of the lever rule is presented for three points on a line segment in a three-phase diagram region. This equation can be exploited to prepare the solution with desired concentrations of a multi-component system and to draw three-phase diagrams.

关 键 词：多组分体系 杠杆原理 相图 相平衡 

分 类 号：O642.42[理学—物理化学] G64[理学—化学]