P. L. LENG ET AL.
Open Access ANP
382
na magnetic
Ni0.25Zn0.75Fe2O4 Calcinations Average particle Average particle Saturation magnetization,Coercivity Peak to peak line factorResonance
Table 1. The average particle sizes (nm) of Ni0.25Zn0.75Fe2O4oparticles determined from XRD and TEM andn
properties observed from VSM and EPR at room temperature.
nanoparticles temperature (K) size XRD (nm) size TEM (nm)Ms (emu/g) field Hc (G)width ΔHpp (G) g- field, Hr (G)
Ni-2.0670Zn ferrite 1 723 9 7 11.414 7 758 3170
Ni-Zn ferrite 2 773 11 9 15.785 10 755 2.08853140
Ni-Zn ferrite 3 823 14 13 20.320 26 753 2.10503118
Ni-Zn ferrite 4 873 23 20 26.447 29 750 2.12203090
nthesis of Ni0.25Zn0.75Fe2O4 nanocrystals with grain
by the Ministry of Higher
[1] A. Goldman, “logy,” 2nd Edition,
6/j.jmmm.2006.02.031
sy
size ranging from 7 to 25 nm at the calcination tempera-
tures from 723 to 873 K as measured by XRD and TEM.
The PVP stabilized the particles and prevented them
from agglomerating. The FTIR measurement confirmed
the removal of all organic matters and leaving pure metal
oxides at 873 K. The VSM results showed that the satu-
ration magnetization increased from 11 emu/g to 26 emu/
g and the coercivity value increased from 7 to 29 G at
calcination temperatures from 723 K to 873 K due to the
increasing of the volume of single domain grains. The
values of g-factor increases with increase of calcination
temperature and particle size were increased. This simple
method, which is cost-effective and environmentally
friendly, produces no toxic byproduct effluents and can
be used to fabricate pure, crystalline spinel ferrite nano-
crystals.
5. Acknowledgements
This work was supported
Education of Malaysia under the FRGS grant. The au-
thors would also like to thank staff of the Faculty of Sci-
ence and the Bioscience Institute of University Putra
Malaysia, who had contributed to this work.
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