), synthesized at various sintering temperatures. We will investigate an intermediate-temperature electrolyte that will decrease the pricey scandia content while simultaneously maintaining the electrochemical performance, enhancing the mechanical strength of the membrane. We are also hoping to bypass the current issues with electric conductivity of the membranes in the scandia-zirconia system influenced by the formation of the poor 𝛽rhombohedral phase. Another objective of this work is to find the optimum sintering temperature that maximizes conductivity and lowers the grain and the grain-boundary resistivity, while the degradation rate is effectively lowered by introducing electronic conductivity provided by the addition of ceria to the system. Bremsstrahlung for higher precision. For structure refinement, the XRD patterns were fitted to JCPDS files no. 01-089-5485, 01-084-9828, and 01-089-5474 for 𝑍𝑟𝑂 ! cubic, tetragonal and monoclinic structures, respectively. The crystallite size was estimated using the Scherrer equation from XRD diffraction peaks using the full width at half maximum (FWHM) of the (111) peak. Samples were sectioned with a low-speed diamond saw (Allied High Tech) and fine-polished to 200 nanometers at 200 rpm (Buehler). The cross-sectional scanning electron microscopy (SEM) and elemental dispersion spectroscopy (EDS) were investigated using FEI Quanta 600 FEG microscope. The Average Grain Intercept method (AGI) was used to determine the grain sizes of the pellets at each sintering condition (ASTM E112) using ImageJ software .