论文部分内容阅读
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。
A simple and efficient method was developed for the synthesis of mono (2-amino-2-pyrimidin-4-one) by the chemical reduction method using Fe (acac) 3 and H2PtCl6 · 6H2O as Fe and Pt sources and NaBH4 as the reductant and PVP as the surfactant Dispersed FePt nanoparticles to study the influence of PVP on the magnetic properties of FePt nanoparticles. Nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and vibrating sample magnetometers (VSM). The results show that the PVP-modified FePt nanoparticles have a face-centered cubic (fcc) structure with a spherical shape and good dispersibility. The coercivity is zero and superparamagnetic. When the ratio of PVP to Fe (acac) 3 was 7: 1, the FePt nanoparticles changed from disordered fcc structure to ordered fct structure with coercivity up to 5460A · m -1.