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Structure and magnetic properties of CoFe2O4 and Fe3O4 nanoparticles

✍ Scribed by L. Chitu; M. Jergel; E. Majkova; S. Luby; I. Capek; A. Satka; J. Ivan; J. Kovac; M. Timko

Publisher
Elsevier Science
Year
2007
Tongue
English
Weight
415 KB
Volume
27
Category
Article
ISSN
0928-4931

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✦ Synopsis

The Fe 3 O 4 and CoFe 2 O 4 nanoparticles of radius 3.2 Β± 0.3 and 3.8 Β± 0.3 nm, respectively, were synthesized by the high-temperature solution phase reaction of metal acetylacetonates. Nanoparticles with the spherical shape and well-developed crystalline structure are superparamagnetic at room temperature. The CoFe 2 O 4 showed high coercivity up to 1.7 T at low temperatures and a step-like change of magnetization at 138 K, which might point at the Verwey transition.

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The magnetic properties of a-Fe 2 O 3 nanoparticles of different shapes (spherical, rhombohedral and acicular), prepared as powders by a chemical route, have been investigated. The particle size effect on the Morin transition (T M = 263 K in the bulk system) have been studied by analyzing the temper