Structural and magnetic properties of Fe and Co nanoparticles embedded in powdered Al 2O 3
The structural and magnetic properties of powdered composites consisting of nanosized Fe and Co particles embedded in alumina grains have been investigated. The composites were synthesized by a novel and simple method using co-precipitation from a hybrid gel solution containing layered double hydrox...
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Published in | Journal of colloid and interface science Vol. 289; no. 1; pp. 63 - 70 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Inc
2005
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Subjects | |
Online Access | Get full text |
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Summary: | The structural and magnetic properties of powdered composites consisting of nanosized Fe and Co particles embedded in alumina grains have been investigated. The composites were synthesized by a novel and simple method using co-precipitation from a hybrid gel solution containing layered double hydroxide and aluminium hydroxide. After a vacuum annealing procedure, the Fe composites have a negligible number of Fe
+3 ions and a high concentration of crystalline
α-Fe nanoparticles having truncated polyhedron shapes with an average diameter of 20 nm that are physically well separated from each other. Magnetization measurements as a function of temperature revealed a superparamagnetic-like behavior characteristic of an assembly of fine particles. A spurious ferromagnetism related to surface interaction between magnetic particles from different powder grains and the formation mechanism of the composites are also discussed. |
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ISSN: | 0021-9797 1095-7103 |
DOI: | 10.1016/j.jcis.2005.03.050 |