Effect of Iron Content on the Properties of FePt Nanoparticles in Water in Oil Microemulsions |
| Journal |
Advanced Materials Research (Volume 32) |
| Volume |
Frontiers in Materials Science and Technology |
| Edited by |
John Bell, Cheng Yan, Lin Ye and Liangchi Zhang |
| Pages |
45-48 |
| DOI |
10.4028/www.scientific.net/AMR.32.45 |
| Online since |
February, 2008 |
| Authors |
Koay Mei Hyie,
Iskandar Idris Yaacob
|
| Keywords |
Iron-Platinum, Microemulsion, Nanoparticle |
| Abstract |
Fe/Pt bimetallic nanoparticles at various molar ratios have been prepared by
simultaneous reduction of FeCl2 and H2PtCl6 with hydrazine hydrate in water/Triton X-
100/cyclohexane/pentanol microemulsions at room temperature. The size, structure, composition
and the magnetic properties of the resultant nanoparticles were characterized by XRD, EDX, TEM
and AGM. XRD patterns indicated the formation of face centered cubic FePt nanoparticles with
crystallite size in the range of 4 nm to 8 nm. Higher content of iron resulted in larger FePt
nanoparticles. EDX analyses on the samples confirmed the presence of Fe and Pt elements in the
particle. The composition for each particle was roughly consistent with the Fe2+ to Pt 4+ ratio of
initial solution. TEM micrograph showed homogeneous fine spherical particles. The physical sizes
were similar to the crystallite sizes of FePt nanoparticles calculated from XRD. The Fe/Pt molar
ratio of 1 to 1 showed optimum magnetic properties with coercivity (Hc) of 68.67 Oe . |
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