ИСТИНА

The paper looks at the developing of a technique for studying the crystal structure of the presented perovskites. During the preparation of this study, the following was carried out: 1) Preparation of perovskite samples; 2) Registration of their x-ray diffraction patterns; 3) Processing of experimental plots of samples; 4) Selection of the most suitable phases for diffraction patterns in the database ICDD PDF-2 data; 5) Search for cif-files of selected phases or their closest analogues selected by space group in the COD database; 6) Search and adaptation to the conditions of the experiment sequence of refinements by the Rietveld method for achieving optimal results; 7) Refinement of the Crystal Structure of Perovskite Samples based on selected crystallographic information files by the Rietveld method; 8) Verification of the obtained results using the elemental analysis; 9) Visualization of experimental unit cell models samples; According to the results, it can be seen that doping rare earth metals affects the structure of the samples. Since elements with large atomic masses were doped relative to other elements in the samples, an increase in the proportion of their presence in the samples leads to an increase in the unit cell parameters of the samples and, consequently, the cell volume.