Synthesis and Structural Properties of Fe Doped $La0.8Sr0.2Ga0.8Mg0.2O3−δ$ (LSGM) as Solid Electrolyte for Solid Oxide Fuel Cell Available to Purchase

$La0.8Sr0.2Ga0.8Mg0.2O3−δ$ (LSGM) is perovskite base oxide material, which exhibits high ion oxygen conductivity, and can it be applied as electrolyte material in solid oxide fuel cell (SOFC). In order to reduce the fuel cell operational temperature, high ionic conductivity must be obtained at lower temperature. High ionic conductivity can be achieved by introducing impurity or defect into material. Doping with Fe for Mg site is expected to increase oxygen ion conductivity in LSGM, since Fe atom has higher valence number $(+3)$ compared with Mg $(+2).$ The LSGM and LSGMF (⁠$La0.8Sr0.2Ga0.8Mg0.2−xFexO3−δ$ with $x = 0,0.05,0.1,0.15$⁠) perovskite structure were synthesized by solid state reaction technique at high temperature and it was sintered at 1350 °C for 24 hours. Crystal structures were analyzed using X‐rays diffractometer and refined using Rietica program. The lattice parameters were determined using Le Bail method in cubic structure with space group of $Pm3m.$ The cell parameters for $La0.8Sr0.2Ga0.8Mg0.2−xFexO3−δ$ (with $x = 0,0.05,0.1,0.15$⁠) were $a = 3.92023(1) Å,$ $a = 3.91056(7) Å,$ $a = 3.89459(9) Å,$ and $a = 3.92463(0) Å.$ Scanning Electron Microscope (SEM) and Energy Dispersive X‐Ray Spectroscopy (EDX) was used to study the grain morphology and elements composition of the LSGMF in order to analyze the effect of Fe substitution.