Sıcaklık ve lantanit iyon katkısının,nano boyutlu çinko borat malzemelerin üretimine etkisi

In this present study, nanosized zinc orthoborate materials were successfully synthesized using various rare earth elements (Dy3+, Eu3+, Sm3+ and Tb3+) with starting materials, zinc (II) nitrate hexahydrate, boric acid and glycine fuel via Solution Combustion Synthesis (SCS) method. The doped zinc orthoborates were synthesized in different lanthanide ion concentrations (0.005, 0.01, 0.02, 0.25 mol) and the products obtained were analyzed using XRD method for the determination of the structural properties. FTIR analysis was performed for the band variation studies. Aditionally, the optical properties were examined by UV-VIS spectroscopy.The effect of different lantanide elements and temperatures (400-900oC) on the structural properties of synthesized zinc orthoborates were studied using XRD characterization. The alpha-zinc orthoborates was obtained at the lower themperature (400-500oC) while the beta form formed at higher temperature (≥700oC) in the formed of triclinic and monoclinic crystal structure, respectively. Analyzing the FTIR data, the bending of BO3 vibrations at 695-720 cm-1, symmetric stretching BO3 vibrations at 1010-1065 cm-1 and asymmetric stretching BO3 vibrations at 1220-1245 cm-1 were determined as the characteristic bands of zinc orthoborates.Optical properties of the products were examined by UV-VIS spectroscopy. The absorbance and reflectance spectra were identified between 200-900 nm. According to the UV-VIS spectra, the bands were detected in the ultraviolet region in the range of 200-400 nm. The optical band gap energies were determined by using UV-VIS absorbance values by taking the intercept of the curve in the x-axis of Tauc plot. It can be seen that the band gap energies found were between 5,14 and 5,40. These values vary depending on the concentration of the lanthanide ion and temperature