包含中间化合物二元相图的热力学分析

对包含中间化台物的二元系,若相图中液相线已测定,而化合物的生成熵或生成焓已知,且液相的过剩熵也被测定(或者可以假设为零),那么体系液相的热力学性质可以精确地计算出来。本文给出了包含中间化合物体系的相图与热力学性质间的关系;这一关系表明:大多致情况下,已知以下五个量中的任意三个,可将其它两个计算出来。这五个量是:相图中的液相线,中间化合物的生成焓及生成熵,液相的混合焓及混合熵。

THERMODYNAMIC ANALYSIS OF BINARY PHASE DIAGRAM INVOLVING AN INTERMEDiATE COMPOUND

In a binary system involving an intermediate compound,if the liquidus has been measured, if the entropy or enthalpy of furmation of intermediate compound has been known, and if the entropy of the liquid phase is known or may be assumed to be ideal, then an exact thermodynamic calculation of the properties of the liquid phase can be made Reversely, if the thermodynamic properties of the liquid phase have known, then the liquidus can be exactly calculated by using only the entropy or enthalpy of formation of intermediate compound. In this paper, general relationships between the phase diagram and thermodynamic properties have been developed, five quantities is sufficient to permit the other two to be calculated exactly: the liquidus, enthalpy of the liquid, entropy of the liquid, enthalpy of formation of intermediate compound, entropy of formation of intermediate compound.