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Název: | Structural and magnetic properties of CoFe2O4 nanoparticles synthesized by starch-assisted sol-gel auto-combustion method in air, argon, nitrogen and vacuum atmospheres | ||||||||||
Autor: | Yadav, Raghvendra Singh; Havlica, Jaromír; Ptáček, Petr; Kuřitka, Ivo; Kožáková, Zuzana; Palou, Martin; Bartoníčková, Eva; Boháč, Martin; Frajkorová, Františka; Másilko, Jiří; Zmrzlý, Martin; Hajdúchová, Miroslava; Enev, Vojtěch | ||||||||||
Typ dokumentu: | Recenzovaný odborný článek (English) | ||||||||||
Zdrojový dok.: | Journal of Superconductivity and Novel Magnetism. 2015, vol. 28, issue 1, p. 249-258 | ||||||||||
ISSN: | 1557-1939 (Sherpa/RoMEO, JCR) | ||||||||||
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DOI: | https://doi.org/10.1007/s10948-014-2854-z | ||||||||||
Abstrakt: | In the present work, structural and magnetic properties of CoFe2O4 nanoparticles synthesized by starch-assisted sol-gel auto-combustion method in air, argon, nitrogen and vacuum atmospheres were investigated. The particle size, shape, crystal structure and magnetic properties of synthesized ferrite nanoparticles were investigated by powder X-ray diffractometer (XRD), field emission scanning electron microscopy (FE-SEM), Raman spectrometer, Fourier transform infrared spectroscopy (FTIR) and a vibrating sample magnetometer (VSM). The FE-SEM micrographs indicate the octahedron-like cobalt ferrite nanoparticles formation in air atmosphere; however, spherical nanoparticles were formed in argon, nitrogen and vacuum atmospheres. An infrared spectroscopy study showed the presence of two absorption bands in the frequency range around 560 cm(-1) (nu(1)) and around 340 cm(-1) (nu(2)) which indicated the presence of tetrahedral and octahedral group complexes, respectively, within the spinel lattice. Room temperature magnetization measurements showed that the saturation magnetization (M-s) and coercivity (H-c) were influenced by cobalt ferrite formation atmosphere, i.e., air, argon, nitrogen and vacuum. | ||||||||||
Plný text: | https://link.springer.com/article/10.1007/s10948-014-2854-z | ||||||||||
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