基于同时平衡原理的Fe-H_2O系电势-pH图  

Potential-pH Diagrams for the Fe-H_2O System Based on the Principle of Simultaneous Equilibrium

作　　者：周雍茂[1] 刘铭[1] 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《长沙理工大学学报（自然科学版）》2004年第2期89-92,共4页Journal of Changsha University of Science and Technology:Natural Science

摘　　要：运用同时平衡原理,讨论了Fe-H2O系中的相平衡关系,绘制了25℃时Fe-H2O系的电势-pH图.由于溶液中所有金属离子都与相应的固相组分同时保持平衡,因此,电势-pH图中出现了一个完整的液相稳定区,而不存在Fe3+与Fe2+之间的平衡线.当温度和压力一定时,各相稳定区的位置和大小仅决定于体系中可溶性组分的总浓度,而与各可溶性组分浓度的相对大小无关.随着液相中铁的总浓度的升高,液相稳定区减小,而固相组分的稳定区相应地扩大.The phase equilibrium relations in Fe-H_2O system were discussed and potential-pH diagrams for Fe-H_2O system at 25 ℃ constructed through the principle of simultaneous equilibrium. There is a complete stability region for liquid phase and no equilibrium line between Fe^(3+) and Fe^(2+) because of the simultaneous equilibrium between all metallic ions and solid species. At a given temperature and pressure, the position and size of the stability region for each phase is determined by the total concentration of all ionic species and independent of relative values of concentrations of ionic species. With increased total iron concentration the stability region for liquid phase shrinks and the stability regions for solid species extend.

关 键 词：同时平衡原理 铁-水系 电势-PH图 化学平衡 

分 类 号：O646.2[理学—物理化学]