Magnetic properties of hematite (α − Fe2O3) nanoparticles synthesized by sol-gel synthesis method: The influence of particle size and particle size distribution

Author:

Tadic Marin1,Panjan Matjaz2,Tadic Biljana Vucetic3,Lazovic Jelena4,Damnjanovic Vesna5,Kopani Martin6,Kopanja Lazar78

Affiliation:

1. Condensed Matter Physics Laboratory , Vinca Institute , University of Belgrade , POB 522, 11001 Belgrade , Serbia

2. Jožef Stefan Institute , Jamova 39, 1000 Ljubljana , Slovenia

3. Institute for Mother and Child Healthcare of Serbia , Belgrade , Serbia

4. Vienna Biocenter Core Facilities , Vienna , Austria

5. Department of Physics , University of Belgrade , Faculty of Mining and Geology , Belgrade , Serbia

6. Institute of Medical Physics, Biophysics, Informatics and Telemedicine, Faculty of Medicine , Comenius University , Bratislava , Slovakia

7. Faculty of Technology and Metallurgy , University of Belgrade , Belgrade , Serbia

8. Faculty of Mathematics and Computer Science , Alfa BK University , Palmira Toljatija 3, 11070 Belgrade , Serbia

Abstract

Abstract Using the sol-gel method we synthesized hematite (α − Fe2O3) nanoparticles in a silica matrix with 60 wt % of hematite. X-ray diffraction (XRD) patterns and Fourier transform infrared (FTIR) spectra of the sample demonstrate the formation of the α − Fe2O3 phase and amorphous silica. A transmission electron microscopy (TEM) measurements show that the sample consists of two particle size distributions of the hematite nanoparticles with average sizes around 10 nm and 20 nm, respectively. Magnetic properties of hematite nanoparticles were measured using a superconducting quantum interference device (SQUID). Investigation of the magnetic properties of hematite nanoparticles showed a divergence between field-cooled (FC) and zero-field-cooled (ZFC) magnetization curves and two maxima. The ZFC magnetization curves displayed a maximum at around T B = 50 K (blocking temperature) and at T M = 83 K (the Morin transition). The hysteresis loop measured at 5 K was symmetric around the origin, with the values of coercivity, remanent and mass saturation magnetization H C10K ≈ 646 A/cm, (810 Oe), M r10K = 1.34 emu/g and M S10K = 6.1 emu/g respectively. The absence of both coercivity (HC300K = 0) and remanent magnetization (Mr300K = 0) in M(H) curve at 300 K reveals super-paramagnetic behavior, which is desirable for application in biomedicine. The bimodal particle size distributions were used to describe observed magnetic properties of hematite nanoparticles. The size distribution directly influences the magnetic properties of the sample.

Publisher

Walter de Gruyter GmbH

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