Open AccessStructure and magnetic properties of NiFe2O4 nanoparticles prepared by low-temperature solid-state reaction
Author(s) -
Jinhong Liu,
Zhang Ling-Fei,
Gengfang Tian,
Jichen Li,
Fashen Li
Publication year - 2007
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.56.6050
Subject(s) - materials science , diffractometer , superparamagnetism , lattice constant , coercivity , nanoparticle , magnetometer , neutron diffraction , grain size , condensed matter physics , analytical chemistry (journal) , squid , anisotropy energy , anisotropy , magnetization , diffraction , magnetic anisotropy , nanotechnology , crystallography , crystal structure , magnetic field , composite material , optics , chemistry , scanning electron microscope , ecology , physics , chromatography , quantum mechanics , biology
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 diffractometervibrating sample magnetometer (VSM) and superconducting quantum interference devices (SQUID) were used to characterize the structuremagnetic 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 materialsmaller magnetizationlarger 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 16nmrespectively.