以多晶La_(0.95)Ca_(0.05)F_(2.95)作固体电解质,LaNi_5-Ni合金作参比电极,Mo丝作电极引线,组成稀土La传感器,直接测定了1023K时Al液中不同La浓度时溶解态La的活度其结果与用氧探头测定的氧浓差电动势的变化规律相符合,遵从La的脱氧平衡规律同时还获得了1023K时Al-La稀溶液体系中有关的热力学数据: △G_(La)=-175.2kJ/mol,γ_((La)(s))=5.85×10~(-7) ε_(La)~(La)=28.7,e_(La)~(La)=0.024
The rare earth La sensors were made by using polycrystallineLa_(0.95)Ca_(0.05)F_(2.95) as solid electrolyte, LaNi_5-Ni as reference electrode and Mo wire as leadwire. And the activity of dissolved La was directly determined with different La concentra-tions in molten Al at 1023 K. The results were in agreement with that of oxygen concentrationcell EMF determined by oxygen sensors. Some thermodynamic data of Al-La system at1023 K were obtained as follows: △G°_(La)=-175.2 kJ/mol, γ°_(La(s) = 5,85×l0~(-7) ε_(La)~(La)= 28.7, e_(La)~(La)=0.024
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