Characterization of Mn0.67Zn0.33Fe2O4 nanoparticles synthesized under different pH
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Nanostructured Mn-Zn ferrites were synthesized using co-precipitation in alkaline
solution with different pH. The samples were characterized using X-ray diffraction (XRD), X-ray
fluorescence (XRF), thermal analysis (TG-DTA), dynamic light scattering (DLS) and scanning
electron microscopy (SEM) techniques. Monophasic nanoparticles were formed when synthesized
with pH 10.5. This sample was heat-treated and its XRD data was refined by the Rietveld method.
Mean crystallite sizes and microstrains were determined from X-ray line profile analysis using
Single-Line and Warren-Averbach methods, which revealed a mean crystallite size of
approximately 10 nm and negligible microstrains. Zn content was estimated using refined cell
parameters, giving a value of 33 at %, in accordance with XRF result. TG-DTA revealed that the
incorporation of α-Fe2O3 occurs around 1130 °C and 1200 °C with recrystallization of the Mn-Zn
ferrite spinel phase. DLS showed that mean particle size increase with temperature up to 1159 nm
at 800 °C. SEM analysis showed the samples agglomerate and present similar morphology with
negligible size changing when calcined between 280 °C and 800 °C. However, the sample calcined
at 1200 °C presents larger agglomerates due to the sintering process.
Como referenciar
ICHIKAWA, RODRIGO U.; YOSHITO, WALTER K.; SAEKI, MARGARIDA J.; MARANHAO, WILLIAN C.A.; GOULART, FATIMA; MARTINEZ, LUIS G. Characterization of Mn0.67Zn0.33Fe2O4 nanoparticles synthesized under different pH. Materials Science Forum, v. 899, p. 48-53, 2017. DOI: 10.4028/www.scientific.net/MSF.899.48. Disponível em: http://repositorio.ipen.br/handle/123456789/28493. Acesso em: 30 Dec 2025.
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