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5074115 
Journal Article 
Co-precipitation synthesis of (Zn-Mn)-co-doped magnetite nanoparticles and their application in magnetic hyperthermia 
de Mello, LB; Varanda, LC; Sigoli, FA; Mazali, IO 
2019 
Yes 
Journal of Alloys and Compounds
ISSN: 0925-8388 
779 
698-705 
WOS:000457154700081 
In this work, a series of zinc- and manganese-co-doped magnetite nanoparticles was synthesized by co-precipitation method and their magnetization and magnetic hyperthermia properties were evaluated according to the degree of doping. The syntheses of the magnetic nanoparticles were carried out in the presence of polyethyleneglycol (PEG) at 353 K using aqueous medium. Several samples was synthesized with nominal composition of (ZnxMn1-xF0.6)Fe2O4, x = (0-0.4). All samples were characterized by XRD and pure spinel structure like was observed, having about 13 nm diameter and truncated octahedral morphology. The magnetometry measures showed that the Zn and/or Mn additions in the magnetite structure contributed to enhance of the saturation magnetization as expected with the highest value of saturation magnetization for Zn-Mn equivalent doped magnetite. The magnetic hyperthermia properties were evaluated in aqueous media at pH 5 for 10 min in a 25 mT and 112 kHz alternating magnetic field and it was observed that manganese-only doped sample reached the highest hyperthermia rate, while Zn doping decreased hyperthermia property. The intrinsic loss power (ILP) values varies from 0.2 to 1.0 nHm(2) kg(-1) with Mn doping values increasing and the magnetic hyperthermia effect was assigned mainly to the Neel-Brownian relaxation process. (C) 2018 Elsevier B.V. All rights reserved. 
Oxide materials; Ferrite; Precipitation; Hyperthermia; Magnetic measurements