期刊
PHYSICA B-CONDENSED MATTER
卷 320, 期 1-4, 页码 206-209出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0921-4526(02)00683-X
关键词
magnetic nanoparticles; hematite; morin transition
The effect of transformation on the structure and magnetic properties of alpha-Fe(2)O(3) acicular nanoparticles (major axis, similar to 330 nm; minor axis, similar to 70 nm) has been investigated. The particles were prepared by hydrolysis and polymerization in an aqueous solution of FeCl(3). Particles in the as-prepared sample are constituted by sub-units of 3-5 nm. The results indicate that the changes in the magnetic properties of the samples under thermal treatments (e.g. Morin transition, superparamagnetic behaviour) are mainly caused by the coalesce of the sub-units and by the variation of the crystallinity of nanoparticles. (C) 2002 Elsevier Science B.V. All rights reserved.
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