Abstract
Potentiometric cells involving halide solid electrolytes were tested for the measurement of oxygen pressure in the temperature range 293–520 K. The sensors consist of a reference system (
or 
), a solid electrolyte (
or 
), and a measuring metal phthalocyanine electrode. The performance characteristics of the cells are reviewed and their behavior is studied as a function of electrolyte doping and the nature of the phthalocyanine central ion. The influence of 
preparation techniques is examined. The oxygen electrode reaction at low temperature is discussed.