Bazı nanoboyutlu ortoboratlar ve ikili metal oksitlerin sentezi ve karakterizasyonu

In the first part of this thesis, the synthesis and structural characterization of magnesium orthoborate (Mg₃B₂O₆) with the kotoite crystal structure were investigated. Initially, the effects of various starting materials and different boron source ratios on the formation of a pure kotoite phase were examined. To obtain products with high phase purity and desirable structural properties, optimal synthesis parameters were systematically determined. Subsequently, doping with selected rare earth elements (RE³⁺) was carried out to evaluate the effects of dopant type and concentration on the physicochemical properties of the synthesized orthoborate materials. The influence of dopant type and concentration was analyzed by assessing changes in crystallite size, surface area, and density, providing insights into the structure–property relationships of doped magnesium orthoborates at the nanoscale. In the second part of the thesis, spinel-type mixed metal oxide nanoparticles with the general formula MMn₂O₄ (where M = Mg, Co, Ni) were synthesized using the solution combustion method. Tartaric acid, glycine, and urea were utilized as fuels to investigate the role of fuel type in governing the structural and chemical characteristics of the resulting spinel phases. The synthesized materials were characterized using X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR). In addition, thermal treatments at various calcination temperatures were applied to assess their influence on crystallinity, phase development, and structural stability. Overall, this work provides a comprehensive understanding of how compositional and processing parameters affect the synthesis, phase formation, and structural properties of borate-based and spinel-type oxide nanomaterials, with potential implications for advanced functional material design.