Synthesis and Study of the Properties of Nanoferrites Obtained by the Sol-gel Method with Participation of Auto-combustion

Authors V.S. Bushkova
Affiliations

Vasyl Stefanyk Pre-Carpathian National University, 57, Shevchenko Str., 76025 Ivano-Frankivsk, Ukraine

Е-mail [email protected]
Issue Volume 7, Year 2015, Number 1
Dates Received 17 October 2014; published online 25 March 2015
Citation V.S. Bushkova, J. Nano- Electron. Phys. 7 No 1, 01023 (2015)
DOI
PACS Number(s) 75.50.Tt, 61.05.cf, 75.75.Fk
Keywords Ferrite (18) , Nanocrystalline powders, Sol-gel technology, Thermal analysis (3) , Cation distribution, Mössbauer spectra, FMR-parameters.
Annotation The aim of the present work was to create and study ferrite nanocrystalline materials of the system (ZnxMg1 – x)1 – yFe2 + 2y / 3O4 with spinel structure using sol-gel technology with participation of auto-combustion. This method is a cheap and low-temperature technique that allows for the fine control on the product’s chemical composition. It was found physical and chemical processes and mechanisms of combustion, which taking place in the synthesis of ferrites using this technology. It was shown that the process of the dry gel auto-combustion the resulting exothermic reaction at a temperature of about 483 K occurred, due to the interaction of carboxyl groups and NO3¯ ions. It was revealed that the synthesized powders were agglomerated. The thermal analysis of ferrite nanopowders was performed using the DTA technique. The results obtained that elimination of small pores between the crystallites or particles of the agglomerates occurs at the heating. It was shown that in the samples peculiarities in transitions of iron cations in octahedral crystallographic position occur, that affects the degree of reversibility of spinel and leads to a weakening of antiferromagnetic interactions between the A-and B-sublattice. The role of zinc concentration of the Mg-Zn ferrite samples in the FMR absorption curves was determined and analyzed.

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