Structure, magnetic properties and hyperthermia of Fe3-xCoxO4 nanoparticles obtained by wet high-energy ball milling.

[Display omitted] • Nanoparticles Fe 3-x Co x O 4 obtained by scalable wet milling method with surfactant. • XRD, TEM data and using the Sharrock's law confirm the formation of nanoparticles. • Cobalt substitution increase the coercivity of the sample. • The maximum values of SLP and ILP of 164 W/g and 1.57 nH·m2/kg were reached. In this work, the methods of X-ray diffraction analysis (XRD), transmission electron microscopy (TEM), Mössbauer spectroscopy (MS), magnetic properties measurements and specific loss measurements (hyperthermia) were used for the investigation of the structure and properties of Fe 3-x Co x O 4 nanoparticles. The Fe 3-x Co x O 4 nanoparticles were synthesized by using high-energy ball milling of Fe and Co mixed with water and surfactant additives. Co substitution increased the coercivity of the samples and changed the kinetics of oxidation process. The presence of cobalt ferrite was verified by MS. TEM images of synthesized samples demonstrated 5–50 nm particle size. Specific loss related heating effect depended mostly on the ratio between the samples coercivity and the amplitude of the high-frequency field. Specific loss power (SLP) and intrinsic loss power (ILP) values reached 164 W/g and 1.57 nH·m2/kg, respectively. [ABSTRACT FROM AUTHOR]