Oxygen Sensors Based on the Electrical Conductivity of the Solid Solutions (Mg 1–x Fe x )O and(Mg 1–x Co x )O

Solid solutions of general compositions (Mg 1‐ x Fe x )O and (Mg 1‐x Co x )O (0.05 ≤ x ≤ 0.25) were investigated with regard to the dependence of their specific electrical conductivity on the oxygen partial pressure (10 −17 ≤ po 2 ≤ 10 5 Pa) at 900 c and 800°C. The experimental results, especially the slopes of plots of log σ vs log po 2 and the stability of the solid solutions studied, indicate that some of these compositions could be used as oxygen sensors at high temperatures.