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Co_2FeAI nanoparticles were synthesized by reducing the coprecipitated precursor of CoCI_2·6H_2O, Fe(NO_3)_3-9H_2O and AI_2(SO_4)_3·18H_2O under H_2 atmosphere with various annealing temperatures and durations.X-ray diffraction and transmission electron microscopy were used to characterize the crystal structure and microstructure of Co_2FeAI particles,respectively.The investigation indicates that the crystal structure of Co_2FeAI particles tends to be B2 structure,in which atoms are partially ordered.The saturation magnetization and hyperfine field of Co_2FeAI particles,which were measured under a vibrating sample magnetometer and a ~(57)Fe 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 Co_2FeAI 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 Co_2FeAI nanoparticles.
Co_2FeAl nanoparticles were synthesized by reducing the coprecipitated precursor of CoCl_2 · 6H_2O, Fe (NO_3) _3-9H_2O and AI_2 (SO_4) _3 · 18H_2O under H_2 atmosphere with various annealing temperatures and durations. X-ray diffraction and transmission electron microscopy were used to characterize the crystal structure and microstructure of Co_2FeAl particles, respectively. The investigation indicates that the crystal structure of Co_2FeAl particles tends to be B2 structure, in which atoms are partially ordered. The saturation magnetization and hyperfine field of Co_2FeAl particles, which were measured under a vibrating sample magnetometer and a ~ (57) Fe 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 Co_2FeAI 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 Co_2FeAl nanoparticles.