摘要
本文给出由二元相图计算组元晶形转变焓及熵的公式。并应用于BaCl_2晶形转变焓及熵的计算,取得与实验近于一致的结果。
A formula has been derived for calculating the enthalpy and entropy of transformation of component from binary phase diagrams,which is △S^B→α=(△S_f^0(α)-RlnX_B~*)(k_α-k_β)/k_β where △S^(β→α)is the entropy of transformation of component B form β form to α form;△S_f^0(α)is the entropy of fusion of component B in α form; R is the ideal gas constant;X_B~* is the mole fraction of component B in liq- uidus at transformation temperature;k_α=(dT/dX_B~α)X_B~*;k_β=(dT/dX_B~β)X_β~*. The application of this formula to calculation of entropy of transforma- tion of BaCl_2 demonstrates that this method is feasible.
出处
《化工冶金》
CSCD
北大核心
1989年第4期10-12,共3页
关键词
相图
相变焓
相变熵
热力学
Thermodynamics
Phase Diagrams
Enthalpy of transformation
Entropy of transformation