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Home > Issues > RetrieveFabrication, Structure, and Magnetic Properties of Pure-Phase BiFeO3 and MnFe2O4 Nanoparticles and their Nanocomposites
Journal of Magnetics, Volume 25, Number 2, 30 Jun 2020, Pages 140-149
Inna Yusnila Khairani (Department of Materials Science and Engineering, Seoul National University), Anindityo Nugra Arifiadi (Department of Materials Science and Engineering, Seoul National University), Jae-Hyeok Lee (Department of Materials Science and Engineering, Seoul National University), Biswanath Bhoi (Department of Materials Science and Engineering, Seoul National University), Sandeep Kumar Singh Patel (Department of Chemistry, MMV, Banaras Hindu University), Sang-koog Kim * 
(Department of Materials Science and Engineering, Seoul National University)
(Department of Materials Science and Engineering, Seoul National University)
Abstract
We fabricated pure-phase BiFeO3 (BFO) and MnFe2O4 (MFO) nanoparticles as well as their nanocomposites
(BMFO), and then we studied their structures and magnetic properties. Pristine BFO nanoparticles of 93.3 nm
average diameter were successfully synthesized using the sol-gel method by varying the solvent condition and
the precursor amount. Pristine MFO nanoparticles with a mean diameter of 70.5 nm were synthesized using
the co-precipitation method entailing the optimization of the preheating and aging steps. The fabricated MFO
nanoparticles showed mostly nanospheres with few nanocubes. The nanocomposite samples of 50 % MFO and
50 % BFO were fabricated through grinding and pelletization, followed by sintering under an inert
atmosphere. The crystal structures of the pristine materials in the nanocomposites were well preserved. The
magnetization values (Ms) of the BFO, MFO, and BMFO were 4.9, 52, and 33 emu/g, respectively. This latter
Ms value was significantly higher than that of BFO, owing to the coexistence of Fe2+ and Fe3+ in its BFO phase
and the incorporation of magnetic MFO. Two synthesis methods and material properties including the
structural, morphological, magnetic, and oxidation states of the BFO-MFO nanocomposites were studied in
order to achieve a high Ms value of 33 emu/g, which is higher than the bulk values of previously reported BFOMFO
composite samples.
(BMFO), and then we studied their structures and magnetic properties. Pristine BFO nanoparticles of 93.3 nm
average diameter were successfully synthesized using the sol-gel method by varying the solvent condition and
the precursor amount. Pristine MFO nanoparticles with a mean diameter of 70.5 nm were synthesized using
the co-precipitation method entailing the optimization of the preheating and aging steps. The fabricated MFO
nanoparticles showed mostly nanospheres with few nanocubes. The nanocomposite samples of 50 % MFO and
50 % BFO were fabricated through grinding and pelletization, followed by sintering under an inert
atmosphere. The crystal structures of the pristine materials in the nanocomposites were well preserved. The
magnetization values (Ms) of the BFO, MFO, and BMFO were 4.9, 52, and 33 emu/g, respectively. This latter
Ms value was significantly higher than that of BFO, owing to the coexistence of Fe2+ and Fe3+ in its BFO phase
and the incorporation of magnetic MFO. Two synthesis methods and material properties including the
structural, morphological, magnetic, and oxidation states of the BFO-MFO nanocomposites were studied in
order to achieve a high Ms value of 33 emu/g, which is higher than the bulk values of previously reported BFOMFO
composite samples.
Keywords: BiFeO3; MnFe2O4; nanocomposites; sol-gel; co-precipitation; magnetic properties
DOI: https://doi.org/10.4283/JMAG.2020.25.2.140
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