CoFe₂O₄ powder has been  synthesized at low temperature (500⁰C) by the combustion of gel prepared from  polyvinyl alcohol (PVA) and solution Co(NO₃)₂ and Fe(NO₃)₃.  Factors affecting on structure and particle size of nanometer  CoFe₂O₄  including temperature of gel formation, molar ratio of ion metal  and polyvinyl alcohol concentration , temperature of calcining were investigated.

The crystalline process and the morphology of  oxide particles were considered by X-Ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Vibrating Sample Magnetometer (VSM). Surface  areas of oxides were determined by the BET ( Brunaure-Emmet-Teller) method. This specific surface area is 42,78 m²/g for CoFe₂O₄.The results indicated that CoFe₂O₄ powders with crystallite size 20-25 nm, H_c = 820 Oe, M_s = 63,5 emu/g, M_r = 22 emu/g have been prepared.

Tải file “Nghiên cứu tổng hợp CoFe2O4 kích thước nanomet bằng phương pháp đốt cháy gel tại đây