Nanocrystalline structure and magnetic properties of barium ferrite particles prepared via glycine as a fuel

The barium ferrite particles were prepared using a self-propagating combustion method with glycine as a fuel. The process was investigated with differential scanning calorimeter and thermogravimetric analysis. The effects of the pH value of the precursor solution, the glycine dosage and calcination temperature on the morphology, the crystalline structure and the magnetic properties of the barium ferrite particles were studied by means of X-ray diffraction, infrared ray spectra, geld emission scanning electron microscopy and vibrating sample magnetometry. The results show that the ignition temperature of glycine gel is lower than that of citric acid gel. The pH value of the precursor solution greatly affects the crystal structure of powders after combustion and calcination. Barium hexaferrite particles with a specific saturation magnetization of 56.1 A m(2)/kg and a coercivity of 398.0kA/m were obtained when the pH value of the precursor solution was 7.0 and the calcination temperature was 850degreesC. (C) 2004 Elsevier B.V. All rights reserved.