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Title: Mössbauer Studies of Core-Shell FeO/Fe{sub 3}O{sub 4} Nanoparticles

Abstract

FeO/Fe{sub 3}O{sub 4} nanoparticles were synthesized by thermal decomposition. Electron microscopy revealed that these nanoparticles were of the core-shell type and had a spherical shape with an average size of ~20 nm. It was found that the obtained FeO/Fe{sub 3}O{sub 4} nanoparticles had exchange coupling. The effect of anisotropy on the efficiency of heating (hyperthermic effect) of FeO/Fe{sub 3}O{sub 4} nanoparticles by an external alternating magnetic field was examined. The specific absorption rate (SAR) of the studied nanoparticles was 135 W/g in the experiment with an external alternating magnetic field with a strength of 600 Oe and a frequency of 310 kHz. These data led to an important insight: the saturation magnetization is not the only factor governing the SAR, and the efficiency of heating of magnetic FeO/Fe{sub 3}O{sub 4} nanoparticles may be increased by enhancing the effective anisotropy. Mössbauer spectroscopy of the phase composition of the synthesized nanoparticles clearly revealed the simultaneous presence of three phases: magnetite Fe{sub 3}O{sub 4}, maghemite γ-Fe{sub 2}O{sub 3}, and wustite FeO.

Authors:
 [1]; ; ; ;  [2]
  1. Kazan Federal University (Russian Federation)
  2. University of South Florida, Department of Physics (United States)
Publication Date:
OSTI Identifier:
22771432
Resource Type:
Journal Article
Journal Name:
Physics of the Solid State
Additional Journal Information:
Journal Volume: 60; Journal Issue: 2; Other Information: Copyright (c) 2018 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7834
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; ABSORPTION; ANISOTROPY; EFFICIENCY; ELECTRON MICROSCOPY; FERRITES; IRON OXIDES; MAGNETIC FIELDS; MAGNETITE; MAGNETIZATION; MOESSBAUER EFFECT; NANOPARTICLES; PYROLYSIS; SATURATION; SPECTROSCOPY; SPHERICAL CONFIGURATION

Citation Formats

Kamzin, A. S., E-mail: Kamzin@mail.ioffe.ru, Valiullin, A. A., Khurshid, H., Nemati, Z., Srikanth, H., and Phan, M. H. Mössbauer Studies of Core-Shell FeO/Fe{sub 3}O{sub 4} Nanoparticles. United States: N. p., 2018. Web. doi:10.1134/S1063783418020129.
Kamzin, A. S., E-mail: Kamzin@mail.ioffe.ru, Valiullin, A. A., Khurshid, H., Nemati, Z., Srikanth, H., & Phan, M. H. Mössbauer Studies of Core-Shell FeO/Fe{sub 3}O{sub 4} Nanoparticles. United States. doi:10.1134/S1063783418020129.
Kamzin, A. S., E-mail: Kamzin@mail.ioffe.ru, Valiullin, A. A., Khurshid, H., Nemati, Z., Srikanth, H., and Phan, M. H. Thu . "Mössbauer Studies of Core-Shell FeO/Fe{sub 3}O{sub 4} Nanoparticles". United States. doi:10.1134/S1063783418020129.
@article{osti_22771432,
title = {Mössbauer Studies of Core-Shell FeO/Fe{sub 3}O{sub 4} Nanoparticles},
author = {Kamzin, A. S., E-mail: Kamzin@mail.ioffe.ru and Valiullin, A. A. and Khurshid, H. and Nemati, Z. and Srikanth, H. and Phan, M. H.},
abstractNote = {FeO/Fe{sub 3}O{sub 4} nanoparticles were synthesized by thermal decomposition. Electron microscopy revealed that these nanoparticles were of the core-shell type and had a spherical shape with an average size of ~20 nm. It was found that the obtained FeO/Fe{sub 3}O{sub 4} nanoparticles had exchange coupling. The effect of anisotropy on the efficiency of heating (hyperthermic effect) of FeO/Fe{sub 3}O{sub 4} nanoparticles by an external alternating magnetic field was examined. The specific absorption rate (SAR) of the studied nanoparticles was 135 W/g in the experiment with an external alternating magnetic field with a strength of 600 Oe and a frequency of 310 kHz. These data led to an important insight: the saturation magnetization is not the only factor governing the SAR, and the efficiency of heating of magnetic FeO/Fe{sub 3}O{sub 4} nanoparticles may be increased by enhancing the effective anisotropy. Mössbauer spectroscopy of the phase composition of the synthesized nanoparticles clearly revealed the simultaneous presence of three phases: magnetite Fe{sub 3}O{sub 4}, maghemite γ-Fe{sub 2}O{sub 3}, and wustite FeO.},
doi = {10.1134/S1063783418020129},
journal = {Physics of the Solid State},
issn = {1063-7834},
number = 2,
volume = 60,
place = {United States},
year = {2018},
month = {2}
}