Rapid calcination of ferrite Ni0.75Zn0.25Fe2O4 by microwave energy |
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Authors: | R B Assis M R D Bomio R M Nascimento C A Paskocimas E Longo F V Motta |
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Institution: | 1. DEMAT, CT, Laboratory of Chemical Synthesis of Materials, UFRN, Av. Sen. Salgado Filho, 3000, Natal, RN, 59072-970, Brazil 2. LIEC, IQ, UNESP, Rua Francisco Degni s/n, Araraquara, SP, 14801-907, Brazil
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Abstract: | Ferrites Ni0.75Zn0.25Fe2O4 were obtained by polymeric precursor method and calcined in a short time with microwave energy to assess the morphological and microstructural characteristics. Samples were calcined at 500, 650, 800, and 950 °C for 30 min in a microwave oven. The resulting powders were characterized by thermal analysis (TG/DSC), X-ray diffraction (XRD), Fourier transform infrared spectrometer, field-emission gun scanning electron microscope (FEG-SEM), and energy-dispersive X-ray spectroscopy. The XRD results showed the formation of single ferrite phase at temperature of 500 °C for 30 min. The FEG-SEM analysis showed agglomerated particles with formation of non-dense longitudinal plates, with interparticle porosity and agglomerated fine particles. The rapid calcination by microwave energy demonstrated satisfactory results in relatively low temperature of 500 °C for 30 min and appeared to be a promising technique for obtaining nickel–zinc ferrite powders. |
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