Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 309, Issue 2, Pages 295-299Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2006.07.012
Keywords
low-temperature solid-state reaction; zinc ferrite; Mossbauer spectra
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ZnFe2O4 nanoparticles with average grain size ranging from 40 to 60 nm behaving superparamagnetic at room temperature have been produced using a low-temperature solid-state reaction (LTSSR) method without ball-milling process. Abnormal magnetic properties such as S-shape hysteresis loops and non-zero magnetic moments were observed. ZnFe2O4 nanoparticles were also synthesized using a NaOH coprecipitation method and a PVA sol-gel method to study the relationship between the preparation processes and the magnetic properties. Spin-glass behavior was observed in the low temperature solid-state reaction produced Zn ferrite in the zero-field cooled (ZFC) measurement. Our work proves that the various preparation methods will to some extent determine the properties of magnetic nanoparticles. (c) 2006 Elsevier B.V. All rights reserved.
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