Characteristics of lanthanum silicates electrolyte for solid oxide fuel cells

Abstract

La9.33 (Si5 V1)O26 ceramics were fabricated by the mixed oxide method for solid oxide electrolytes. La9.33 (Si5 V1)O26 specimens showed the hexagonal, space group P63 or P63/m, and the unit cell volume increased when the sintering temperature increased. The specimen sintered at 1,400˚C showed the X-ray patterns of the homogeneous apatite single phase without the second phase, such as La2 SiO5 and SiO2. The specimen sintered at 1,400˚C showed the maximum sintered density of 4.93 g/cm3. When the sintering temperature increased, the electrical conductivities increased, the activation energy decreased and the values were 7.83×10-4 S/cm, 1.61 eV at 600˚C, respectively. ?2015, KIEEME. All rights reserved.