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Synthesis and Magnetic Properties of Single‐Crystals of MnFe 2 O 4 Nanorods
Author(s) -
Wang Jun,
Chen Qianwang,
Hou Binyang,
Peng Zhenmeng
Publication year - 2004
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200300555
Subject(s) - nanorod , high resolution transmission electron microscopy , chemistry , coprecipitation , magnetization , transmission electron microscopy , annealing (glass) , hydrothermal circulation , selected area diffraction , crystallography , nanotechnology , hydrothermal synthesis , analytical chemistry (journal) , chemical engineering , materials science , inorganic chemistry , magnetic field , metallurgy , physics , chromatography , quantum mechanics , engineering
Single‐crystals of MnFe 2 O 4 nanorods with an average diameter of 20 nm and length of 250 nm were synthesized by a hydrothermal process at 180 °C after 12 h. High‐resolution transmission electron microscopy (HRTEM) and electron diffraction (ED) analysis revealed that the nanorods grow along the [110] axis, which is one of the easy magnetization axes of the material MnFe 2 O 4 . It was found that the nanorods exhibited a saturation magnetization ( Ms ) of 68.02 emu/g, which is much higher than that of quasi‐spherical particles of MnFe 2 O 4 , prepared by other approaches such as solid‐state reaction methods ( Ms = 36.7 emu/g), and coprecipitation processes followed by annealing in vacuo at 400 °C ( Ms = 24.4 emu/g). The oriented growth along the easy magnetization axis of MnFe 2 O 4 was suggested to be responsible for the improvement of magnetic properties of MnFe 2 O 4 nanorods. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)