ポリオールプロセスを用いたL1_0-FePtナノ粒子直接合成における添加剤効果

概要

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Partially ordered L1_0-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 L1_0-FePt nanoparticles by introducing nucleating and complexing agents during the synthesis. Though the synthesis of L1_0-FePt particles with constant physical properties was possible by using hexachloroplatinate (H_2PtCl_6) as the nucleating agent, particles remained polycrystalline in nature. However, when carboxylic acid was used along with H_2PtCl_6 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, 1at% H_2PtCl_6 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 L1_0 phase. The coercivity and anisotropy field of these particles were 5.6kOe and more than 40 kOe, respectively.
社団法人日本磁気学会の論文
2005-08-01