2021-03-232015-01-010304384315729540SCOPUS;2-s2.0-84933180053http://hdl.handle.net/10784/27154In this paper we report the effect of divalent cobalt on the structural and magnetic properties of substituted magnetites, Fe 3-xCo xO4, with ?=Co 2+/Fe = 0, 5, 10, 15, 20 and 30 % wt, synthesized by the coprecipitation method. The samples were characterized by Atomic Absorption Spectroscopy, X-ray Diffraction, room temperature Mössbauer Spectroscopy and Vibrating Sample Magnetometry. The effect of Co 2+ was found to depend strongly of the concentration employed in the synthesis process. For ?=15 % the Co 2+ promotes the formation of particles more crystalline and with higher saturation magnetization, remanence and coercivity than those obtained in absence of this cation. A sequential increasing of the lattice parameter is observed, as well as a reduction in the hyperfine magnetic field of the Fe 2.5+sub spectrum, while the hyperfine magnetic field of the Fe 3+sub spectrum keeps almost constant. For ?=20 % and 30 % the crystallinity of the samples decreases, particle size distribution effects are evidenced and the saturation magnetization decreases drastically. The results suggest that for low Co 2+ contents the substitution of Fe 3+by Co 2+ at octahedral sites of the inverse spinel system is the dominant effect, while for the highest concentrations used the substitution of Fe 2+ by Co 2+ and the increasing of the particle size distribution are the dominant effects. © 2015, Springer International Publishing Switzerland.enghttps://v2.sherpa.ac.uk/id/publication/issn/0304-3843Influence of Co2+ on the structural and magnetic properties of substituted magnetites obtained by the coprecipitation methodarticleDivalent cobaltMössbauer spectroscopySubstituted magnetites2021-03-23Velásquez, A.A.Urquijo, J.P.10.1007/s10751-015-1122-3