Rare earth doped ceria with a fluorite-type structure has attracted extensive attentions due to its excellent electrical, catalytic and mechanical properties. For example, CeO₂ with other rare earth oxides is studied as electrolyte in solid oxide fuel cells (SOFC) due to its higher oxygen conductivity than that of ZrO₂ solid solution, as thermal barriers coatings, as hosts for the storage of radioactive waste, and more recently in Metal Oxide Semiconductor (MOS). Lanthanum–Cerium Oxide (La2Ce2O7) has been synthesized by co-precipitation method. Thermogravimetric analysis (TGA) of the as-prepared sample was examined from room temperature to 1000°C at a heating rate of 10°C/min under nitrogen atmosphere having a flow rate of 20 mL/min. The as prepared samples were calcined at temperature range from 400°C -1050°C. X-ray diffraction study (XRD) Analysis, SEM and TEM analysis reveal that pure La₂Ce₂O₇ nanoparticles with fiuorite structure are successfully synthesized in the current research.Moreover no phase transition is seen at higher temperature. FTIR analysis was performed of La₂Ce₂O₇ nanopowder calcined at 750 ºC in the wave number range 400-4000 cm^-1. It also low thermal conductivity so can be a candidate material for thermal barrier coating TBC.

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