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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.55  No.5 (2014)  >  pp.813-817

MATERIALS TRANSACTIONS
<<Previous article Vol.55  No.5 (2014)   pp.813 - 817 Next article>>

Characterization of Spinel-Structured Iron Oxide Nanoparticles Synthesized by Heating of α-FeOOH Platelets in Tetra-Ethylene Glycol

Hawa Latiff1), Mikio Kishimoto1), Akari Horiuchi1), Atsushi Seki1), Ryoichi Miyamoto2), Hideto Yanagihara1), Tatsuya Oda2), Nobuhiro Ohkohchi2), Eiji Kita1)
1) Institute of Applied Physics, University of Tsukuba 2) Department of Surgery, Advanced Biomedical Applications, Graduate School of Comprehensive Human Science, University of Tsukuba

Fe3O4 particles were synthesized from platelet α-FeOOH particles by a liquid-phase reduction process using tetra-ethylene glycol as reduction agent, for their application in hyperthermia or thermoablation therapies that employ hysteresis-loss heating. Fe3O4 particles 60–100 nm in size were finally obtained by heating. The saturation magnetization of the obtained particles increased with the heating time to reach a maximum value of approximately 80 Am2/kg. In contrast, the coercive force of the particles was nearly constant at approximately 12–13 kA/m and was independent of the heating time. Lattice image observation of the synthesized Fe3O4 particles revealed to obtain single crystals. On the basis of experimental results, it was concluded that the single-crystal Fe3O4 particles were formed by recrystallization through the dissolution and precipitation of iron ions from α-Fe2O3 formed by the dehydration of α-FeOOH. The recrystallization of the Fe3O4 particles was promoted with increasing α-FeOOH particle content in tetra-ethylene glycol up to about 0.022 g/mL.


Keyword:
nanoparticles, spinel-structured iron oxides, magnetic properties, polyhydric alcohol, single crystal

Received: December 05, 2013
Accepted: February 12, 2014 , Published online: April 25, 2014
Copyright © 2014 Japan Society of Powder and Powder Metallurgy

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