In this work, Y2O3-stabilized tetragonal polycrystalline zirconia (Y-TPZ) nanoparticles used to prepare electrolyte pellets for solid oxide fuel cell operated at high temperature (HT-SOFC) compacted by cold press method with various applied pressure and sintered at 1823⁰ K. Electrical conductivity of sintered electrolyte measured at 723ºK. Phases of sintered specimens were determined by X-ray diffraction (XRD). The DC electrical conductivity of electrolyte measured to be 3.32 x 104S/m. XRD results show that Tetragonal zirconia phase has obtained. Crystallite size calculated based on Williamson-Hall method, which was found to be between 26 nm to 43 nm. Lattice parameter calculated by Rietveld refinement method. The physical characterization including the density of electrolyte investigated that obtained maximum density reached to 6.395 g/cm3. The maximum electrical conductivity at 723⁰ K measured to be 3.32 x 104S/m. XRD results obtained tetragonal zirconia phases formed with crystallite size between 26 nm to 43 nm.
