Physicochemical Properties of Potential Cathode La1-xBaxMn1-yCryO3 and Anode Sr2NiMoO6 Materials for Solid-Oxide Fuel Cells

The homogeneity area boundaries of La 1-x Ba x Mn 1-y Cr y O 3 solid solutions possessing orthorhombic and rhombohedral structures were established. A state diagram at 1373 K in air in the quaternary oxide system LaMnO 3 -BaMnO 3 -BaCrO 4 -LaCrO 3 was drawn for the first time. Partial substitution of Mn with Cr in La 1-x Ba x MnO 3 stored the thermal compatibility of the cathode with the any traditionally used electrolyte but reduced the electric conductivity of the potential cathode. Based on the linear lengthening measurements of La 1-x Ba x Mn 1-y CryO 3 and Sr 2 NiMoO 6 samples the values of the thermal expansion coefficients were calculated. It was established that the temperature of the structure transition from a tetragonal to a cubic phase in Sr 2 NiMoO 6 occurred at 508 K. It was stated that double perovskite Sr 2 NiMoO 6 in air did not react with (La 0.9 Sr 0.1 ) 0.98 Ga 0.8 Mg 0.2 O 3 up to 1073 K.