Structural, Thermal, Electrical and Dielectric Properties of La1-xSrxMn0.50Fe0.50O3{0.10 ≤ x ≤ 0.40} Cathode Material for Solid Oxide Fuel Cells

La1-xSrxMn0.50Fe0.50O3 {0.10 ≤ x ≤ 0.40} perovskite ceramics material is prepared by solid-state reactionmethod and samples are characterized to study their structural, thermal, electrical and dielectricproperties. X-ray diffraction results show that as prepared samples are well crystallized in singlephase and have rhombohedral crystal structure. Density is measured by Archimedes principle andwith Sr substitution its value decreasing. Thermogravimetric analysis shows the weight gain in thematerial above 300 ºC. Thermal expansion coefficient value for x = 0.10 and 0.40 composition isfound to be 12.9 × 10-6 ºC−1 and 11.3 × 10-6 ºC−1, respectively upto 800 ºC. Impedance analyzer is usedto study dielectric and electrical properties which show that all the as prepared samples obey non-Debyerelaxation behaviour. The maximum conductivity value is 121.09 S cm-1 for x = 0.10 and 155.96 Scm-1 for x = 0.40 at 600 ºC and 303.59 S cm-1 for x = 0.10 and 362.35 S cm-1 for x = 0.40 at 800 ºCwhich confirmed that in the experimental perovskite the conductivity increases after Sr doping.Activation energy also found to be decreases with Sr substitution. Therefore, studied properties confirmedthat the as-prepared material is a suitable cathode material for intermediate temperature solid oxide fuelcells (SOFCs).