Synthesis α-Fe2O3 nanosized by the gel combustion method.

Abstract

α-Fe₂O₃ powder has been  synthesised at low temperature (600^oC) by the combustion of gel prepared from polyvinyl alcohol (PVA) and iron nitrates. Factors affecting on process synthesis of nanometer oxides α-Fe₂O₃ including temperature of gel formation, molar ratio of concentration of ion metal  and the concentration of polyvinyl alcohol, temperature of calcining on structure and sizes were investigated. The crystalline process and the morphology of oxides particles were considered by X-Ray diffraction (XRD), Scanning Electron Microscopy (SEM). Surface areas of oxides were determined by the BET (Brunaure-Emmet-Teller) method. Further thermal treatment at 400 - 700^oC for 2 hours yields the single phase α-Fe₂O₃. It specific surface area is 35.5 m²/g for Fe₂O₃.