Showing papers by "Vladislav V. Kharton published in 1994"

Physicochemical and electrochemical properties of La{sub 1-x}Pb{sub x}MnO{sub 3} (x = 0.1-0.6) solid solutions

Abstract: Perovskite-like solid solutions based on lanthanum manganite are promising materials for electrodes of high-temperature electrochemical devices with oxide solid electrolytes. Substitution of lead for lanthanum significantly enhances the electrical conductivity both of ceramic materials and of electrode layers of manganites; in addition, the substitution increases the catalytic activity of mixed oxides. La{sub 0.8}Pb{sub 0.2}MnO{sub 3} has been recommended as a material for the electrodes of electrochemical oxygen sensors. The present work studies the physicochemical and electrochemical properties of La{sub 1-x}Pb{sub x}MnO{sub 3} (x = 0.1-0.6) mixed oxides.

Ionic transport in Sr(Ba)CoO{sub 3-{delta}} solid solutions

Abstract: Mixed perovskite-like oxides based on strontium cobaltate exhibit high oxygen conductivity superimposed over the much higher electronic conductivity and are, therefore, promising materials for producing different high-temperature electrochemical devices. The maximum oxygen conductivity was found in SrCo{sub 1-x}Fe{sub x}O{sub 3-{delta}} solid solutions with x = 0.2-0.3. The high ionic conductivity of strontium cobaltate ferrites is likely to arise from both the stabilization of the cubic perovskite structure of strontium cobaltate and the relatively low iron-oxygen bond energy. The cubic perovskite structure ABO{sub 3} can be stabilized by substitution of larger cations at the A site. In this paper, the authors report studies on the physicochemical properties of Ba-substituted strontium cobaltate.