Katkısız ve katkılı magnezyum oksit nanoparçacıkların sentezi ve karakterizasyonu

In this study, undoped and rare earth, RE, metal ion (RE:Pr+3, Ho+3, Tb+3) doped magnesium oxide nanoparticles were synthesized by solution combustion synthesis method. The products obtained were well characterized by X-ray Diffraction (XRD), Infrared Spectroscopy (IR), Scanning Electron Microscopy (SEM), EDX (Energy Dispersive X-ray Analysis) techniques. In the first part of this work, undoped magnesium oxide (MgO) was prepared using magnesium nitrate (Mg(NO₃)₂.6H₂O) as an oxidizer and various fuels; tartaric acid, urea, citric acid, 1,6-Diaminohexane, hexamethylenetetramine, β-Alanine, glycine and carbohydrazide as reducers through the solution combustion method. It was found that tartaric acid, urea, citric acid, 1,6-diaminohexane, hexamethylenetetramine fuels were suitable while β-alanine, glycine and carbohydrazide fuels were not suitable in the synthesis of MgO nanoparticles because of causing very low amount of yield of the products. Hence the appropriate fuels were selected for the further processes in the synthesis of nano sized magnesium oxides. In the second part of this thesis, 0.005, 0.01, 0.03 moles of RE metal ion (Pr+3, Ho+3, Tb+3) doped MgO were synthesized using five different fuels; tartaric acid, hexamethylenetetramine, 1,6-Diaminohexane, citric acid, urea. In order to get rid of the organic compounds and to obtain a more crystalline material, the prepared products by combustion process at 400°C for 10 min. were heated at 400°C, 500°C respectively for one hour. Then, characterization was performed with IR, XRD, SEM, EDX for each concentration and temperature. Continuation of this work, the effect of temperature, fuel, type of RE metal, concentration of RE metal on the properties of synthesized magnesium oxides such as crystallinity, crystallite size, purity and morphology were investigated.