Isıl işlemin bazı nano boyutlu metal boratlar ve hidrotalsit malzemelerin fabrikasyonu üzerindeki etkisi

This work investigated the impact of thermal processing on the fabrication of some nanosized metal borates and layered double hydroxides (LDHs). Metal borates and hydrotalcite materials were prepared via solution combustion synthesis (SCS), and sol-gel method, respectively. X-ray diffraction and FTIR spectroscopy were conducted for structural analysis, while UV-Vis, FESEM, and EDX provided insights into optical properties, morphology, and elemental composition of the synthesized materials. In the first part of this study, The XRD analysis revealed that rare earth-doped magnesium pyroborates, Mg2B2O5: RE3+ (RE: Ce3+, Eu3+, Tb3+) crystallized in monoclinic phases at 800°C, transitioning to triclinic phases at higher temperatures. Tartaric acid was identified as the most effective fuel and the optical band gap energy found to be between 3.20-5.70 eV. The FESEM-EDX studies confirming the presence of all elements in irregular granular morphology. In the second part, nanosized beta-Li4B2O5 was successfully synthesized for the first time using SCS with tartaric acid and glycine fuel, achieving high crystallinity rhombus-like morphology at 640°C and decomposing into Li3BO3 and Li6B4O9 at higher temperatures. The optical band gap calculated to be varied from 3.00-3.05 eV. Additionally, the lithium magnesium borate was also prepared for the first instances with tartaric acid fuel at 400°C. In the last part, nanosized double-metal substituted, Mg3-x-yZnxMy (M: Cu and Mn)/Al1 LDHs were fabricated in plate-like morphology through low-temperature processing. EDX analysis confirmed the presence of all elements, while DRS analysis revealed that MgZnMn/Al LDHs had smaller optical band gaps (2.24-2.51 eV) than MgZnCu/Al LDHs (2.98–3.02 eV).