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PVP對FePt納米顆粒磁性能的影響
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國家自然科學(xué)基金（51061009）；甘肅省高?；究蒲谢?/p>


Effect of Poly(N-vinyl-2-pyrrolidone) on Magnetic Properties of FePt Nanoparticles
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    摘要:

    以乙酰丙酮鐵(Fe(acac)3)和氯鉑酸(H2PtCl6·6H2O)作為Fe源和Pt源，硼氫化鈉(NaBH4)作為還原劑，PVP作為表面活性劑，通過化學(xué)還原法制備出單分散的FePt納米顆粒，研究PVP對FePt納米顆粒磁性能的影響。通過X射線衍射(XRD)儀，透射電子顯微鏡(TEM)和振動樣品磁強(qiáng)計(VSM)對納米顆粒進(jìn)行表征。結(jié)果表明：PVP修飾的FePt納米顆粒為面心立方（fcc）結(jié)構(gòu)，形狀近似球形且分散性良好，矯頑力為零，呈超順磁性。當(dāng)PVP與Fe(acac)3的比例為7:1時，經(jīng)600 ℃熱處理保溫30 min，F(xiàn)ePt納米顆粒從無序的fcc結(jié)構(gòu)轉(zhuǎn)變?yōu)橛行虻膄ct結(jié)構(gòu)，矯頑力最大，可達(dá)5460 A·m-1

    Abstract:

    With Fe(acac)3 as Fe3+source and H2PtCl6·6H2O as Pt4+source, FePt nanoparticles were prepared via chemical reduction process using NaBH4 and poly (N-vinyl-2-pyrrolidone) (PVP) as reductant and surfactant, respectively. The effect of PVP on magnetic properties of FePt nanoparticles was investigated. The as-prepared FePt nanoparticles were characterized by X-ray powder diffraction (XRD), transmission electronmicroscopy (TEM) and vibrating sample magnetometer (VSM). The results show that PVP modified FePt nanoparticles are of face-centered-cubic (fcc) structure, which are spherical shapes with good mono-dispersibility. The particles display superparamagnetic as the coercivity is zero. For the FePt nanoparticles with PVP/Fe(acac)3=7:1, the structure transforms from face-centered-cubic (fcc) to face-centered-tetragonal (fct) after the sample is annealed at 600 °C for 30 min in argon atmosphere, with its coercivity reaching as high as 5400 A·m-1

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杜雪巖,劉廣菊,楊洪奎,屠桂鵬. PVP對FePt納米顆粒磁性能的影響[J].稀有金屬材料與工程,2013,42(5):1009~1012.[Du Xueyan, Liu Guangju, Yang Hongkui, Tu Guipeng. Effect of Poly(N-vinyl-2-pyrrolidone) on Magnetic Properties of FePt Nanoparticles[J]. Rare Metal Materials and Engineering,2013,42(5):1009~1012.]
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  • 收稿日期:2012-05-16
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