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Nanosized zinc and magnesium ferrites obtained from PVA–metal nitrates’ solutions

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Abstract

The paper presents a study regarding the possibility of obtaining zinc and magnesium ferrites starting from poly(vinyl alcohol)–metal nitrates solutions. By controlled heating of these solutions, a redox interaction takes place leading to the formation of some coordination compounds of the involved metal cations with the oxidation products of poly(vinyl alcohol) (PVA). FT-IR spectroscopy has evidenced the disappearance of the NO 3 anions at 140 °C due to the redox interaction with PVA. Thermal analysis evidenced the difference in the interaction of the individual metal nitrates and PVA and thus the particularity of the preparation of each ferrite. The thermal decomposition of the synthesized precursors was finished below 400 °C as resulting from both thermal analysis and FT-IR spectroscopy. The obtained ferrites powders consist of fine nanoparticle with diameters ranging from 10 to 30 nm for the powders annealed at 500 °C, as resulting from the SEM images. The specific surface area of the powders obtained at 500 °C was 32.2 m2 g−1 for ZnFe2O4 and 21.7 m2 g−1 for MgFe2O4, characteristic of nanoscaled powders. The increasing of the annealing temperature at 1,000 °C leads to sintering of both ferrites, more advanced in the case of zinc ferrite.

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Abbreviations

PVA:

Poly(vinyl alcohol)

FT-IR:

Fourier Transform Infrared Spectroscopy

SEM:

Scanning Electron Microscopy

XRD:

X-Ray Diffraction

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Correspondence to Marcela Stoia.

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Stoia, M., Tudoran, L.B. & Barvinschi, P. Nanosized zinc and magnesium ferrites obtained from PVA–metal nitrates’ solutions. J Therm Anal Calorim 113, 11–19 (2013). https://doi.org/10.1007/s10973-012-2888-z

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