Phase Structure and Heat Generation in the Co-Precipitated Magnetite Nanoparticles
P. Pawlik, M. Pruba, K. Pawlik and K. Kotynia
Institute of Physics, Częstochowa University of Technology, al. Armii Krajowej 19, 42-200 Częstochowa, Poland
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In the present studies the phase structure and magnetic ordering of magnetite nanoparticles were investigated. The powder samples were obtained by co-precipitation from Fe(III) and Fe(II) salts. SiO2 coating was performed using the modified Stöber process. X-ray diffraction studies revealed presence of the only one Fe3O4 crystalline phase both for the non-coated and SiO2-coated samples. The Mössbauer studies have shown differences in shapes of measured spectral lines for Fe3O4 particles subjected to the Stöber process and non-coated particles. The heating efficiency was measured for glycerol dispersed nanoparticles. The analysis have shown changes in specific loss power depending on the concentration of the nanoparticles and amplitude of alternating magnetic field.

DOI: 10.12693/APhysPolA.131.1217
PACS numbers: 75.47.Lx, 78.67.Bf, 78.70.Ck, 76.80.+y, 87.50.S-