摘要
采用电化学沉积法制备FePt颗粒。将氯铂酸、硫酸亚铁按一定比例混合成溶液100mL,调pH值为2.5,调节脉冲电源参数制备FePt颗粒,并通过XRD、TEM、VSM等研究颗粒的微观结构以及宏观磁性能。XRD分析表明,所制备的FePt纳米颗粒具有面心立方(fcc)结构,在800℃热处理后转变为面心四方(fct)结构;TEM观察显示,颗粒呈类球形,粒径在4nm左右。VSM测试表明,制备的FePt纳米颗粒的矫顽力为零,呈现超顺磁性。热处理后其矫顽力约为1.2×104A/m,饱和磁化强度为72.20A.m2/kg。
FePt nanoparticles were prepared by an electrodeposited method,in which 100mL of H2PtCl6 and FeSO4 solution with pH value of 2.5 and the pulse power parameters were used.The microstructure and magnetic properties of nanoparticles were investigated by XRD,TEM and VSM.XRD results show that FePt nanoparticles are of fcc structure and some of them transform into fct structure after annealing at 800℃.It can be seen from TEM photos that most of the nanoparticles have a size of around 4.0nm.VSM investigations indicate that the coercivity of the as-synthesized FePt nanoparticles are near zero,implying superparamagnetic properties,and about 1.2×104A/m after heat treatment,respectivily.
出处
《粉末冶金技术》
CAS
CSCD
北大核心
2011年第1期38-40,49,共4页
Powder Metallurgy Technology
基金
甘肃省高校基本科研基金
国家自然科学基金项目(51061009)
关键词
电化学
制备
FePt颗粒
磁性
electrochemistry
preparation
FePt nanoparticles
magnetism
