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Influence of annealing on magnesioferrite nanoparticles synthesized by a sol-gel/combustion method

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Influence of annealing on magnesioferrite nanoparticles synthesized by a sol-gel/combustion method

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Título Influence of annealing on magnesioferrite nanoparticles synthesized by a sol-gel/combustion method
Autor Biasi, Ronaldo Sergio de
Cardoso, Lúcia Helena Guimarães
Campos, José Brant de
Sanchez Candela, Dalber Ruben
Cunha, Joao Batista Marimon da
Resumo Nanocrystalline particles of magnesioferrite (MgFe2O4) were prepared by a sol-gel/combustion method using iron nitrate, Fe(NO3)3.9H2O, magnesium nitrate, Mg(NO3)2.6H2O, and citric acid, C6H8O7.H2O, and annealed for 2 hours at 400, 500 and 600 °C. The average particle size, determined by X ray diffraction, was found to depend on the annealing temperature and varied from 〈D〉 = 8.1 to 〈D〉 = 17.8 nm. By measuring at several temperatures the relative intensity of the Mössbauer spectra due to superparamagnetic particles and to ferrimagnetic particles, we determined the size distribution of the nanoparticles in the samples. It was found to be a log-normal distribution with a most probable diameter that varied from Dm = 6.4 to 17.2 nm and a full width at half-height ΔD in the 5-6 nm range.
Contido em Materials research : ibero-american journal of materials. Vol. 12, no. 2 (Apr./June 2009), p. 225-227
Assunto Ciência dos materiais
Espectroscopia mossbauer
Nanoparticulas
Ressonancia ferromagnetica
[en] Maegnesioferrite
[en] Mössbauer spectroscopy
[en] Nanoparticles
Origem Nacional
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/20793
Arquivos Descrição Formato
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