FORMATION AND PROPERTIES OF REACTION LAYERS OF COBALTITE ELECTRODES ON BISMUTH OXIDE ELECTROLYTES

Interaction of electrodes consisting of perovskite-like rare earth ele ments (REE) and strontium cobaltites with Bi0.75Y0.25O1.5 solid electr olyte has been studied. Formation of solid solutions La1-x-ySrxBiyCoO3 -delta (x = 0-0.5; y = 0-0.1) as well as (Bi1-xCox)(1-y)YyO1.5 (x=0-0. 4; y =0-0.25) can occur in the diffusion layer between cobaltite elect rodes and Bi2O3-based solid electrolytes. The crystal structure, elect rical conductivity and oxygen permeability of these solid solutions ha ve been investigated. It has been found that the values of the conduct ivity and oxygen permeability of La(Sr,Bi)CoO3-delta solid solutions d ecrease with increasing bismuth content. The results of the investigat ion of polarization resistance of oxide electrodes in contact with Bi0 .75Y0.25O1.5 solid electrolyte are presented.