PVP对FePt纳米颗粒磁性能的影响  

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

作　　者：杜雪岩[1] 刘广菊[1] 杨洪奎[1] 屠桂鹏[1] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,甘肃兰州730050

出　　处：《稀有金属材料与工程》2013年第5期1009-1012,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51061009);甘肃省高校基本科研基金

摘　　要：以乙酰丙酮铁(Fe(acac)3)和氯铂酸(H2PtCl6·6H2O)作为Fe源和Pt源,硼氢化钠(NaBH4)作为还原剂,PVP作为表面活性剂,通过化学还原法制备出单分散的FePt纳米颗粒,研究PVP对FePt纳米颗粒磁性能的影响。通过X射线衍射(XRD)仪,透射电子显微镜(TEM)和振动样品磁强计(VSM)对纳米颗粒进行表征。结果表明:PVP修饰的FePt纳米颗粒为面心立方(fcc)结构,形状近似球形且分散性良好,矫顽力为零,呈超顺磁性。当PVP与Fe(acac)3的比例为7:1时,经600℃热处理保温30min,FePt纳米颗粒从无序的fcc结构转变为有序的fct结构,矫顽力最大,可达5460A·m-1。With Fe（acac）3 as Fe3＋ source and H2 PtCl 6·6H2O as Pt4＋ source, FePt nanoparticles were prepared via chemical reduction process using NaBH 4 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 .

关 键 词：FEPT纳米颗粒 PVP 矫顽力 

分 类 号：TB383.1[一般工业技术—材料科学与工程]