Characterization of Mn0.67Zn0.33Fe2O4 Nanoparticles Synthesized under Different pH

Rodrigo Uchida Ichikawa; Walter Kenji Yoshito; Margarida Juri Saeki; Willian C.A. Maranhão; Fátima Goulart; Luís Gallego Martinez

doi:10.4028/www.scientific.net/MSF.899.48

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HomeMaterials Science ForumMaterials Science Forum Vol. 899Characterization of Mn0.67Zn0.33Fe2O4...

Characterization of Mn_0.67Zn_0.33Fe₂O₄ Nanoparticles Synthesized under Different pH

Abstract:

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.

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Periodical:

Materials Science Forum (Volume 899)

Pages:

48-53

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.899.48

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Online since:

July 2017

Authors:

Rodrigo Uchida Ichikawa*, Walter Kenji Yoshito, Margarida Juri Saeki, Willian C.A. Maranhão, Fátima Goulart, Luís Gallego Martinez

Keywords:

Dynamic Light Scattering, Mn-Zn Ferrite Nanoparticles, Scanning Electron Microscopy, Thermal Analysis, X-Ray Diffraction, X-Ray Fluorescence

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