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Structure and magnetic properties of NiFe2O4 nanoparticles prepared by low-temperature solid-state reaction

Liu Jin-Hong Li Fa-Shen Tian Geng-Fang Li Ji-Chen Zhang Ling-Fei

Structure and magnetic properties of NiFe2O4 nanoparticles prepared by low-temperature solid-state reaction

Liu Jin-Hong, Li Fa-Shen, Tian Geng-Fang, Li Ji-Chen, Zhang Ling-Fei
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Publishing process
  • Received Date:  10 March 2007
  • Accepted Date:  12 May 2007
  • Published Online:  05 May 2007

Structure and magnetic properties of NiFe2O4 nanoparticles prepared by low-temperature solid-state reaction

  • 1. (1)兰州大学磁学与磁性材料教育部重点实验室,兰州 730000; (2)兰州大学磁学与磁性材料教育部重点实验室,兰州 730000;中国原子能科学研究院中子散射实验室,北京 102413; (3)英国曼彻斯特大学物理与天文学院,曼彻斯特 M60 1DQ; (4)英国曼彻斯特索尔福德大学材料科学研究所,曼彻斯特 M5 4WT

Abstract: NiFe2O4 nanoparticle series samples in the grain size range of 8—47nm were successfully synthesized by low-temperature solid-state reaction. The X-ray diffractometer (XRD),HRPT neutron powder diffractometer,vibrating sample magnetometer (VSM) and superconducting quantum interference devices (SQUID) were used to characterize the structure,magnetic properties and surface anisotropy of nanoparticles. Data of XRD and neutron diffraction showed that the lattice constants of NiFe2O4 nanoparticles were lager than that of the bulk counterpart. Oxygen parameters suggested that lattice distortion were decreased with reduced particle sizes. In comparison with the bulk material,smaller magnetization,larger coercive force and anisotropy energy density for nanoparticles were observed. The critical sizes for transition from multidomain to single domain and for superparamagnetic transition were estimated to be 40nm and 16nm,respectively.

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