Protonic conduction in Zr-substituted BaCeO 3

Abstract

Zr-substituted BaCeO 3 (BaCe 0.9− x Zr x Y 0.1O 3− α ) was synthesized and its electrical conduction behavior and chemical stability were investigated. Single phases were confirmed over the whole range of x values (0.0≤ x≤0.9). These oxides exhibited pure protonic conduction in hydrogen-containing atmosphere while they showed protonic, oxide ionic and electronic mixed conduction under high oxygen partial pressure at elevated temperatures. The chemical stability against CO 2 increased with an increase in zirconium content, although the protonic conductivity decreased with increasing x.