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

Abstract

<p>The homogeneity area boundaries of La<sub>1-x</sub>Ba<sub>x</sub>Mn<sub>1-y</sub>Cr<sub>y</sub>O<sub>3</sub> solid solutions possessing orthorhombic and rhombohedral structures were established. A state diagram at 1373 K in air in the quaternary oxide system LaMnO<sub>3</sub>-BaMnO<sub>3</sub>-BaCrO<sub>4</sub>-LaCrO<sub>3</sub> was drawn for the first time. Partial substitution of Mn with Cr in La<sub>1-x</sub>Ba<sub>x</sub>MnO<sub>3</sub> 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<sub>1-x</sub>Ba<sub>x</sub>Mn<sub>1-y</sub>CryO<sub>3</sub> and Sr<sub>2</sub>NiMoO<sub>6</sub> 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<sub>2</sub>NiMoO<sub>6</sub> occurred at 508 K. It was stated that double perovskite Sr<sub>2</sub>NiMoO<sub>6</sub> in air did not react with (La<sub>0.9</sub>Sr<sub>0.1</sub>)<sub>0.98</sub>Ga<sub>0.8</sub>Mg<sub>0.2</sub>O<sub>3</sub> up to 1073 K.</p>