OXYGEN PERMEABILITY OF PEROVSKITES IN THE SYSTEM SRCOO3-DELTA-SRTIO3

Existence of two concentration ranges of solid solutions with cubic pe rovskite-like structure has been ascertained in the SrCoO3-delta-SrTiO 3 system. It has been found that an increase in titanium concentration in SrCo1-xTixO3-delta leads to a decrease In electrical conductivity and oxygen permeability of cubic solid solutions. Oxygen transfer thro ugh ceramics SrCo(Ti)O3-delta has been shown to be limited by the proc ess of oxygen exchange with gas phase. Application of platinum layers on the surface of cobaltites-titanates results in substantial buildup of oxygen permeability. Thermal expansion coefficients of the above ox ide materials lie in the range 11-21 x 10(-6) K-1.