The Application of Lanthanum Sensor in the Study on the Lanthanum Activity in Carbon Saturated Iron Liquid Solution and Its Solidified Process

摘要

In this work, La_(0.95)Ca_(0.05)F_(2.95) solid electrolyte was prepared. The rare earth La sensor was made by using polycrystalline La_(0.95)Ca_(0.05)F_(2.95) as solid electrolyte, pure La as reference electrode and Mo wire as lead wire. The cell can be expressed as: Mo|La_(a) or La_((I))|La_(0.95)Ca_(0.05)F_(2.95|[La]_(Fe)|Mo ceramal The activity of dissolving La in carbon saturated iron liquid solution (1300°C ) with different La concentration was determined. The result was in agreement with that of oxygen concentration cell e.m.f determined by oxygen probe. The activity change of La with temperature in the solidified process (from 1350°C ) was also determined. The result shows regularity. In the course of the rising and falling of the temperature, the La probe can be continuously used.