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- Title
Nanosized zinc and magnesium ferrites obtained from PVA-metal nitrates' solutions.
- Authors
Stoia, Marcela; Tudoran, Lucian; Barvinschi, Paul
- 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 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 m g for ZnFeO and 21.7 m g for MgFeO, 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.
- Subjects
POLYVINYL alcohol; MAGNESIUM nitrate; SOLUTION (Chemistry); CATIONS; ZINC ferrites; NANOPARTICLES; EFFECT of temperature on metals
- Publication
Journal of Thermal Analysis & Calorimetry, 2013, Vol 113, Issue 1, p11
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1007/s10973-012-2888-z