Sentez koşullarının bazı nanoboyutlu çinko ortoborat malzemelerin kristal yapıları üzerindeki etkisi

In this present study, nanosized zinc orthoborate materials were successfully synthesized using various fuels (urea, glycine, tartaric acid, HMTA, citric acid, and β-Alanine) with starting materials, zinc (II) nitrate hexahydrate and boric acid by Solution Combustion Synthesis (SCS) method. The products were characterized using X-Ray Diffraction (XRD), Infrared spectroscopy (FTIR) and UV-VIS spectroscopy. The effects of different fuels and temperatures (400-900oC) on the structural properties of synthesized products were analyzed using XRD technique. Examining XRD data, the alpha-Zn3B2O6 as triclinic was detected at 600oC for all fuels except glycine fuel. The transformation of alpha phase to beta-Zn3B2O6 as monoclinic was observed at 700oC and higher temperatures. The particle size of the synthesized alpha and beta form of zinc orthoborates were found in nano scale through the calculation of XRD data by Debye-Scherrer's equation. Due to these calculations, the crystallite sizes of the alpha zinc orthoborates were found in the range of 14-24 nm whereas beta zinc orthoborates between 22-31 nm. Analyzing the FTIR data, the bending of BO3 vibration 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 detected as the characteristic bands of zinc orthoborates. Optical properties of the products were investigated by diffuse reflectance spectroscopy, DRS measurements. The absorbance and reflectance spectra were assigned between 200-900 nm. At 600oC and 700oC the spectra of all synthesized products with different fuels are observed in blue shift in order of citric acid, HMTA, urea, tartaric acid, glycine and beta-alanine. KEYWORDS: Solution Combustion Synthesis (SCS), zinc orthoborate, nanosized, XRD, FTIR.