SnF2标准生成Gibbs自由能的测定

采用LaF3单晶(掺杂)作为固体电解质,在多次抽空充氩气的操作箱内,将Pb,Sn磨细过筛,按照4∶1的比例分别将Pb,PbF2,Sn,SnF2混合并压成片·Pb PbF2为参比电极,Sn SnF2为工作电极,银丝为电极引线组成工作电池·电池的结构为:(+)Ag|Pb,PbF2|LaF3单晶(掺杂)|Sn,SnF2|Ag(-)·用高阻数字电压表准确测定了电池在293 15～353 15K范围内的电动势·以两种PbF2标准生成Gibbs自由能数据和电池电动势为基础,计算得到SnF2标准生成自由能同温度的关系·电池电动势测量的实验误差远远小于PbF2标准生成Gibbs自由能数据中所给定的误差,采用两...

Measurement of SnF2 Standard Gibbs Free Energy of Formation

The work cells introducing LaF3 single crystal (mixed) as solid electrolyte was prepared using Pb-PbF2 reference electrode, Sn-SnF2 work electrode and Ag electrode wire by means of grinding, sieving and mixing Pb, PbF2, Sn and SnF2 together and pressing them into thin piece in a ratio of 4:1. The whole operating process was done in a box filled in with Ar gas. Its composition is (+)Ag|Pb,PbF2|LaF3 single crystal (mixed) |Sn,SnF2|Ag(-). The EMF (electromotive force) of cell was measured in the temperature rang from 293.15 K to 353.15 K. The relationship between SnF2 standard Gibbs free energy of formation and temperature was calculated on the basis of two kinds of PbF2 standard Gibbs free energy of formation. Because the EMF measuring errors are far smaller than that of PbF2 Gibbs free energy and the difference between two expressions of SnF2 standard Gibbs free energy of formation is very small, both the calculated results as above are confirmed reliable.