Abstract
Partially ordered L10-FePt nanoparticles synthesized in tetraethylene glycol by using polyol process is mostly polycrystalline in nature. In this paper, we attempted the preparation of single crystal L10-FePt nanoparticles by introducing nucleating and complexing agents during the synthesis. Though the synthesis of L10-FePt particles with constant physical properties was possible by using hexachloroplatinate (H2PtCl6) as the nucleating agent, particles remained polycrystalline in nature. However, when carboxylic acid was used along with H2PtCl6 FePt nanoparticles with more than 50 % ordering was realized under the optimum experimental conditions of Fe:Pt initial mole ratio of 52.5:47.5, 1 at% H2PtCl6 and five equivalent weight of Fe of carboxylic acid. The superlattice reflection lines of (001) and (110) in XRD pattern and the sextets from the Mossbauer spectroscopy at room temperature confirmed the presence of L10 phase. The coercivity and anisotropy field of these particles were 5. 6 kOe and more than 40 kOe, respectively.
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