Properties of Co2FeAl Heusler Alloy Nano-particles Synthesized by Coprecipitation and Thermal Deoxidization Method

doi:10.1016/j.jmst.2013.01.001

Abstract

Abstract:

Co₂FeAl nanoparticles were synthesized by reducing the coprecipitated precursor of CoCl₂·6H₂O, Fe(NO₃)₃·9H₂O and Al₂(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 Co₂FeAl particles, respectively. The investigation indicates that the crystal structure of Co₂FeAl particles tends to be B2 structure, in which atoms are partially ordered. The saturation magnetization and hyperfine field of Co₂FeAl particles, which were measured under a vibrating sample magnetometer and a ⁵⁷Fe Mössbauer 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 Co₂FeAl 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 Co₂FeAl nanoparticles.

Key words: Heusler alloy, Coprecipitation, Magnetic property

J.H. Du, Y.L. Zuo, Z. Wang, J.H. Ma, L. Xi. Properties of Co₂FeAl Heusler Alloy Nano-particles Synthesized by Coprecipitation and Thermal Deoxidization Method[J]. J. Mater. Sci. Technol., 2013, 29(3): 245-248.

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Properties of Co₂FeAl Heusler Alloy Nano-particles Synthesized by Coprecipitation and Thermal Deoxidization Method

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