Preparation, electrical conductivity and stability are discussed for Nd-doped barium cerate with partial substitution of zirconium for cerium. BaCe0.9ZrxNd0.1O2.95 with 0.1 less than or equal to x less than or equal to 0.9 was prepared by direct reaction of mixtures of barium carbonate and the corresponding metal oxides. Structural properties of BaCe0.9-xZrxNd0.1O2.95 were investigated by X-ray diffraction and raman scattering. Single phases were obtained over the entire range of x-values, if reaction temperatures above 1500 degrees C were applied. The total conductivity was measured as a function of temperature and for different conditions of p(H2O), p(O-2) in N-2. Only a slight decrease in the total conductivity was found up to 60%-zirconium substitution. In addition, the oxygen ion conductivity was determined for 600 degrees C-800 degrees C using an ion conducting microelectrode made from stabilized zirconia. The oxygen ion conductivity was lower than the total conductivity by about two orders of magnitude. The observed total conductivity is therefore attributed primarily to proton conductivity.