IngentaConnect Effect of composition on phase transformation of ironplatinum nan...

Authors: Hyie, K.M.¹; Yaacob, I.I.²

Source: Materials Research Innovations, Volume 13, Number 3, September 2009 , pp. 214-216(3)

Abstract:

Iron-platinum (FePt) nanoparticles were prepared by coreduction of H₂PtCl₆ and FeCl₂ with hydrazine in water/triton X-100/cyclohexane microemulsions. The as synthesised FePt nanoparticles showed disordered face centred cubic (fcc) structure. After annealing at 700°C for 1 h, Pt₃Fe phase was formed for samples with Fe/Pt molar ratios 1 : 1 and 1 : 3, while long range ordered L1₀ face centred tetragonal (fct) phase was formed for sample with Fe/Pt molar ratio of 3 : 1. The crystallite sizes of annealed FePt nanoparticles were 53, 61 and 22 nm for Fe/Pt molar ratios of 3 : 1, 1 : 1 and 1 : 3 respectively. The hysteresis loops measured by alternating gradient magnetometer (AGM) revealed that the Pt₃Fe exhibited soft magnetic behaviour while fct FePt was a hard magnetic material and had higher coercivity. The physical sizes estimated from transmission electron micrograph (TEM) were similar to those of FePt nanoparticles calculated from X-ray diffraction (XRD) data.

Keywords: IRON-PLATINUM; MICROEMULSIONS; NANOPARTICLES; TRANSITION

Document Type: Research article

DOI: 10.1179/143307509X440334

Affiliations: 1: Center for Nanotechnology, Precision and Advanced Materials, Department of Mechanical Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;, Email: hyie1105@yahoo.com 2: Center for Nanotechnology, Precision and Advanced Materials, Department of Mechanical Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia

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Effect of composition on phase transformation of iron-platinum nanoparticles