Disorder that occurs at the dissimilar phase interfaces in oxide composite materials is favorable for water adsorption, therefore, is also favorable for appearance of proton conductivity at these interfaces. High composite conductivity requires a developed network of phase interfaces implemented in thin films synthesized at low temperatures. Such thin-film materials may turn out to be promising proton electrolytes for solid oxide fuel cells designed for low-temperature operation. LaZrO_3.5 pyrochlore + LaScO₃ perovskite composite materials in the form of films up to 250 nm in thickness served as a model object for investigation of this effect. The films were deposited onto ZrO₂+10 mol.% Y₂O₃ single-crystal substrates by spreading the measured amounts of alcoholic nitrate solutions and examined in the entire composition range from 0 to 100 % LaScO₃. Conductivity measurements of the films using the impedance method in the 250-500 ^oC range proved that the maximum conductivity occurred in the 1:1 composite material in humid air. The effect was not available in dry air. Keywords: oxide films, composite materials, perovskite LaScO₃, pyrochlore La₂Zr₂O₇, impedance, proton conductivity.

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