Four potentiometric sensor cells have been prepared by using La<sub>0.95</sub>Pb<sub>0.05</sub>F<sub>2.95</sub> as solidelectrolyte(SE) and various materials as e
With O<sub>2</sub> and CO as the molecular probes,the reactivity of oxygen species of perovskite-likeoxides SmMnO<sub>3</sub> and SmFeO<sub>3</sub> was studied