Optimization of Magnetic and Structural Properties of Sr Ferrite Prepared by Low-Temperature Combustion |
| A. Grusková, V. Jančárik, J. Sláma and M. Ušáková
Faculty of Electrical Engineering and Information Technology, Slovak University of Technology, Ilkovičova 3, 812 19 Bratislava, Slovakia |
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| Received: 9 07 2007; |
| Fine strontium hexaferrite particles were prepared by the low temperature auto-combustion method. Aqueous solution of the corresponding metal salts and a combustible co-reactant compound -- glycine were used as initial precursor. The resulting powders were calcined at various temperatures from 750 °C up to 1100 °C. The microstructure and magnetic properties were investigated by the Mössbauer spectroscopy, thermomagnetic analysis, scanning electron microscopy, and vibrating magnetometer. The particles of sizes less than 1 μm have monophasic hexagonal structure. Coercivity Hc≈400 kA/m, specific saturation polarization Js-m≈72×10-6 Tm3 kg-1 and remanence polarization Js-r≈43×10-6 T m3 kg-1 were achieved for the Sr ferrite annealed at 850 °C for 6 h. |
| DOI: 10.12693/APhysPolA.113.557 PACS numbers: 75.50.-y, 75.50.Ww, 74.25.Ha, 33.45.+x |