期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 370, 期 -, 页码 87-95出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2014.06.014
关键词
CoFe2O4; Superparamagnetic nanoparticle; Polyol; Process; TEM-SEM; Ferrimagnetic ceramic; SPS
资金
- MINAFC ANR (France)-CONACyT (Mexico) [139292]
Starting from polyol-made CoFe2O4. ferrite nanoparLicles of different aggregation states, high density fine-grained ceramics were produced using Spark Plasma Sintering technique at 600 and 500 degrees C, under vacuum and applying a uniaxial pressure of more than 80 MPa. The grain growth of thus produced ceramics appears to be proportional to the temperature plateau and inversely proportional to the aggregation state of the initial powders. Average grain sizes ranging between about 50 and 350 nm were obtained. In all the cases, magnetic measurements evidenced a ferrimagnetic behavior at room temperature with non-zero coercivity, while their starting powders exhibited superparamagnetic features. (C) 2014 Elsevier B.V. All rights reserved.
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