Rapid calcination of ferrite Ni0.75Zn0.25Fe2O4 by microwave energy
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Data
2014-10-01
Autores
Assis, R. B.
Bomio, M. R. D.
Nascimento, R. M.
Paskocimas, C. A.
Longo, E. [UNESP]
Motta, F. V.
Título da Revista
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Editor
Springer
Resumo
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 A degrees 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 A degrees 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 A degrees C for 30 min and appeared to be a promising technique for obtaining nickel-zinc ferrite powders.
Descrição
Palavras-chave
Ni-Zn ferrite, Spinel, Polymeric precursors, Rapid calcinations, Microwave
Como citar
Journal Of Thermal Analysis And Calorimetry. Dordrecht: Springer, v. 118, n. 1, p. 277-285, 2014.