状态图与状态函数——如何选择相图坐标

来源期刊：中南大学学报(自然科学版)1998年第3期

论文作者：刘立斌 金展鹏

文章页码：51 - 53

关键词：相图;热力学;热力学函数

Key words：phase diagram; thermodynamics; thermodynamic function

摘    要：每一个相图均有一状态函数与之对应,状态函数的自变量即相图的坐标变量.在相图计算过程中,判断一个图是不是相图的最可靠办法是看能不能推导出一个与之相应的状态函数.将一相图坐标换成对应状态函数中与之成对的另一状态变量,所得的图仍是相图;同一容量性质与强度性质对的两变量不能同时作为相图坐标;在相图坐标中的所有容量性质所针对的对象必须相同,而且强度性质坐标的选法必须与容量坐标的选法相对应.并以铅锡相图为例进行了说明.

Abstract: Every phase diagram should have a related thermodynamic function. The variants in the thermodynamic function should be the axes of related phase diagram. This character can be used to distinguish phase diagram from other diagrams. A phase diagram can change to another phase diagram by exchange the intensive properties to its related extensive properties, vice versa. The related intensive and extensive properties can not be axes in the same phase diagram. All extensive axes in the phase diagram should refer to the same object. The intensive axes should be chosen according to the extensive axes in the same phase diagram. The Pb-Sn system is given as an example.