Synthesis and magnetic properties of Co sub(1-)xn sub()xe sub(2)O sub(4+) gamma nanoparticles as materials for magnetic fluid hyperthermia

Nanoparticles of the single spinel phase Co sub(1-)xn sub()xe sub(2)O sub(4+) gamma of mean size 3-23 nm, as determined by X-ray diffraction analysis, were synthesized by the co-precipitation method followed by a temperature treatment. Magnetic studies carried out in the range of 4.5-550 K revealed...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2010-08, Vol.322 (16), p.2386-2389
Main Authors: Veverka, M, Veverka, P, Jirak, Z, Kaman, O, Knizek, K, Marysko, M, Pollert, E, Zaveta, K
Format: Article
Language:English
Subjects:
Diffraction
Hyperthermia
Magnetic fluids
Magnetic properties
Nanoparticles
Particle size
Transition temperature
X-rays
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Summary:Nanoparticles of the single spinel phase Co sub(1-)xn sub()xe sub(2)O sub(4+) gamma of mean size 3-23 nm, as determined by X-ray diffraction analysis, were synthesized by the co-precipitation method followed by a temperature treatment. Magnetic studies carried out in the range of 4.5-550 K revealed gradual transition from ferrimagnetic to superparamagnetic to paramagnetic behaviour depending on the composition and particle size. The observed behaviour indicates a broad distribution of volume sizes of the nanoparticles. Particular importance can be ascribed to the composition of x=0.6 where the observed transition temperature to the paramagnetic state at 310-334 K suggests applicability of this material for magnetic fluid hyperthermia in a self-controlled regime.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2010.02.042