Synthesis and Structural Properties of Fe Doped Lao.SSrO.2GaO.sMgo.203-o(LSGM) as Solid Electrolyte for Solid Oxide Fuel Cell


L!IogSrO.2G!IogMgo203.~(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
(L!IogSro2G!IogMgo2.xFCx03.~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 L!IogSro2G!IosMgo2-xFCx03_~(with x = 0, 0.05, 0.1, 0.15)
were a = 3.92023(1) A, a = 3.91056(7) A, a = 3.89459(9) A, and a = 3.92463(0) A. 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.
Keywords: Perovskite, Solid Oxide Fuel Cell, LSGM dope-Fe, Solid State Reaction, X-rays diffractionRusmiati, B. Prijamboedi, and Ismunandar
Inorganic and Physical Chemistry Research Divisian,Facuity afMathematics and Natural Sciences,
Institut Telmalagi Bandung, Jl. Ganesha 10, Bandung, INDONESIA