Effect of Iron and Cobalt Substitution on the electrical properties of Praseodymium based perovskites

Abstract

Praseodymium-based perovskite samples of Pr_0.8Sr_0.2Fe_xCo_1−xO₃ (x = 0.2, 0.4, 0.6, and 0.8) (PSFCO) manufactured by sol-gel technique. TEM images established particles size and cluster of particles as per morphology. The thermal behavior and electrical properties of prepared samples were characterized by a dilatometer and LCR impedance meter which are necessary for the development of the solid oxide fuel cells. The variations in dielectric loss and dielectric constant concerning frequency temperature and also thermal expansion of all samples were studied. The substitution of Iron and Cobalt content shows a great variation in the dielectric behavior and thermal expansion coefficient, which explains chemical compatibility of the cathode materials using electrolyte and shows higher ionic conductivity with lower values of thermal expansion, which plays a key part in SOFC applications.