Structure and Magnetic Properties of S-doped Mn₃O₄/S Composited Nanoparticles and Mn₃O₄ Nanoparticles

X.He,Z.H.Wang,D.Y.Geng and Z.D.Zhang Shenyang National Laboratory for Materials Science,Institute of Metal Research,and International Centre for Materials Physics,Chinese Academy of Sciences,Shenyang 110016,China

摘 要：Composited nanoparticles,consisting of Mn3O4,S-doped Mn3O4 and S,were synthesized by co-precipitation reaction and Mn3O4 nanoparticles were then obtained after removing the pure S from the composited nanoparticles.The Mn3O4-type phase with larger lattice constant a was formed by doping sulfur.At fixed temperatures below Curie temperature（TC）,the magnetization of the S-doped Mn3O4/S composited nanoparticles was smaller than that of the Mn3O4 nanoparticles.The blocking temperature was 36.3 and 34.8 K for Sdoped Mn3O4/S composite and Mn3O4 nanoparticles,respectively.The anisotropy field of S-doped Mn3O4/S composite was determined to be about 55.3 kOe.

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