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Type: Artigo
Title: Synthesis and magnetic interaction on concentrated Fe3O4 nanoparticles obtained by the co-precipitation and hydrothermal chemical methods
Author: Jesus, A.C.B.
Jesus, J.R.
Lima, R.J.S.
Moura, K.O.
Almeida, J.M.A.
Duque, J.G.S.
Meneses C.T.
Abstract: In this work, a comparative study of the synthesis and magnetic properties of Fe3O4 nanoparticles obtained by the co-precipitation and hydrothermal methods with the adding of the sucrose as a chelating agent is reported. The analysis of transmission electron microscopy (TEM) show that particles are spherical-like with an average particle size ranging of 3 ≤d ≤ 10 nm. Magnetization measurements as a function of an applied magnetic field and temperature are consistent with a superparamagnetic behavior with small TB values. The analysis of the MvsH loops measured at T = 2 K and Zero-Field-Cooled and Field-Cooled (ZFC−FC) curves allows us to estimate the average diameter of Fe3O4 nanoparticles. These results are in good agreement with those obtained through X-ray diffraction (XRD) data (by using Scherrer equation and Williamson-Hall plot) and slightly smaller than those estimated using TEM images. Finally, ZFC−FC data are also used to evaluate the effective anisotropy constants, which are similar to those values found in literature considering the average sizes values estimated by different techniques
Subject: Anisotropia
Microscopia eletrônica de transmissão de alta resolução
Country: Reino Unido
Editor: Elsevier
Rights: Fechado
Identifier DOI: 10.1016/j.ceramint.2020.01.135
Date Issue: 2020
Appears in Collections:IFGW - Artigos e Outros Documentos

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