Journal
JOURNAL OF ELECTRONIC MATERIALS
Volume 46, Issue 2, Pages 1145-1154Publisher
SPRINGER
DOI: 10.1007/s11664-016-5081-5
Keywords
Ferrites; magnetic properties; microwave-assisted hydrothermal method
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Funding
- CAPES (Coordenacao de Aperfeioamento de Pessoal de Nivel Superior)
- CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico)
- FAPEMA (Fundacao de Amparo a Pesquisa do Estado do Maranhao)
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Ceramic spinel-based ferrites of cobalt, nickel and zinc were prepared by means of the microwave-assisted hydrothermal method. All samples were thoroughly characterized using different techniques for their structural, compositional, phonic and magnetic properties. The Rietveld analysis of x-ray powder diffraction data revealed the crystallinity as well single-phase partially inverse spinel structure. Wavelength dispersive x-ray fluorescence measurement indicates a good correlation between the empirical stoichiometry. The estimated average crystallite size varies between 9 nm and 13 nm (XRPD) and 6 and 14 nm for high-resolution transmission electron microscopy measurements. In addition, the observed micro-strain varies in the range of 0.01-0.6%. All samples show a quasi-spherical morphology and slight agglomeration. Infrared and Raman data spectra exhibit characteristic modes for spinel-based ferrites. Direct current magnetic measurements indicate behavior typical of magnetically soft materials system at 300 K.
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