Four compositions in the range of 85-90 % CeO₂,  the other being SrO, CaO or Y₂O₃ combined two or three were studied. The mixtures have been homogenized by a wet route for 10 hours. After drying the obtained powders were subjected to thermal analysis which showed that in the process of grinding chemical changes occur. The apparent and relative densities were measured on the samples sintered at temperatures of 1350 and 1400^°C resulting that the relative densities of the samples are between 79 and 92%. X-ray diffraction revealed that the main mineralogical compound of the samples, thermally treated in the range of 1300-1400^°C, is a solid solution with a structure of fluorite type specific to CeO₂. For some samples were also identified CaY₄O₇ and SrCeO₃, compounds resulting  by solid-phase reactions and two solid solutions of the type SrCe_0,85Y_0,15O_2,95 and (Ce,Y)₂O₃.The microstructure of the studied samples was investigated by electron microscopy and the results showed that the samples exhibit rounded and needle-shaped grains of different sizes. Electrical measurements have shown that three of samples have a corresponding behavior to solid electrolytes usable for IT-SOFC cells.