Combustion synthesis, sintering and magnetical properties of nanocristalline Ni-Zn ferrites doped with samarium |
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Authors: | Ana Cristina F M Costa Márcio R Morelli Ruth H G A Kiminami |
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Affiliation: | (1) Department of Materials Engineering, Federal University of Paraíba, 58970-000 Campina Grande, PB, Brazil |
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Abstract: | An investigation was made of combustion synthesis to uniformly incorporate small amounts of samarium additive into nanocrystalline Ni0.5Zn0.5Fe2 – x
Sm
x
O4 (0.0 x 0.1) nanopowders (26–20 nm particle size). The effect of the addition of the rare-earth ion samarium on the microstructure, relative density and magnetic properties of the Ni-Zn ferrite obtained by combustion reaction was studied. The samples were uniaxially compacted by dry pressing, sintered at 1200°C/2 h, and characterized by bulk and apparent density, XRD, SEM and magnetic properties. The nanopowder samples without additive displayed an average grain size of 2.87 m, while the addition of 0.05; 0.075 and 0.1 wt% Sm was found to inhibit grain growth, decreasing the average grain size to 0.77; 0.68 and 0.62 m, respectively. The relative density was found to increase with the addition of samarium (>98.00% of the theoretical density). The samples without additive showed higher hysteresis parameter values. |
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