Properties of Co2FeAl Heusler Alloy Nano-particles Synthesized by Coprecipitation and Thermal Deoxidization Method
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2013年第3期
论文作者：J.H.Du Y.L.Zuo Z.Wang J.H.Ma L.Xi
文章页码：245 - 248
摘 要：<正>Co2FeAI nanoparticles were synthesized by reducing the coprecipitated precursor of CoCI2·6H2O, Fe（NO3）3-9H2O and AI2（SO4）3·18H2O under H2 atmosphere with various annealing temperatures and durations.X-ray diffraction and transmission electron microscopy were used to characterize the crystal structure and microstructure of Co2FeAI particles,respectively.The investigation indicates that the crystal structure of Co2FeAI particles tends to be B2 structure,in which atoms are partially ordered.The saturation magnetization and hyperfine field of Co2FeAI particles,which were measured under a vibrating sample magnetometer and a 57Fe Mossbauer spectroscope,are consistent with those of the bulk sample and thin films.Furthermore,the higher annealing temperature and the longer annealing time,the better crystallinity of Co2FeAI and more ordered arrangement of atoms will be.It turned out that the coprecipitation thermal deoxidization method could be an easy and high efficient way to obtain the half-metallic Co2FeAI nanoparticles.
J.H.Du，Y.L.Zuo，Z.Wang，J.H.Ma，L.Xi
Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education,Lanzhou University
摘 要：<正>Co2FeAI nanoparticles were synthesized by reducing the coprecipitated precursor of CoCI2·6H2O, Fe（NO3）3-9H2O and AI2（SO4）3·18H2O under H2 atmosphere with various annealing temperatures and durations.X-ray diffraction and transmission electron microscopy were used to characterize the crystal structure and microstructure of Co2FeAI particles,respectively.The investigation indicates that the crystal structure of Co2FeAI particles tends to be B2 structure,in which atoms are partially ordered.The saturation magnetization and hyperfine field of Co2FeAI particles,which were measured under a vibrating sample magnetometer and a 57Fe Mossbauer spectroscope,are consistent with those of the bulk sample and thin films.Furthermore,the higher annealing temperature and the longer annealing time,the better crystallinity of Co2FeAI and more ordered arrangement of atoms will be.It turned out that the coprecipitation thermal deoxidization method could be an easy and high efficient way to obtain the half-metallic Co2FeAI nanoparticles.
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