الفهرس 
Introduction and Article ReviewOnly 14 pages are availabe for public view
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Abstract
The citrate sol-gel process used for preparation of modified M/Ni
Zn Fe2O4 (M = Al, Ce, Sm, and Zr) nanostructures and calcined at
800oC for 3h, in the air. The sol-gel process was used because of
its potential for making fine, high purity and homogeneous
powders. Sol-gel is a facial chemical method that has the
possibility of preparing a reproducible material in nanoscale and
the advantage of the calcination of reducing the total processing
time and the calcination temperature. At this study it was added
some cations through Ni0.5Zn0.5Fe2O4 such as Al2O3, Ce2O3, Sm2O3,
Zr2O4 as the formula AlxNi0.5-xZn0.5Fe2O4 , where (x = 0.0, 0.1, 0.2,
0.3), CexNi0.5Zn0.5-x Fe2O4 , where (x = 0, 0.1,0.2,0.3), SmxNi0.5Zn0.5-
xFe2O4 , where (x = 0, 0.2, 0.4, 0.5) and Sm0.4-XZrXNi0.5Zn0.1Fe2O4
,where (x= 0.2,0.3), to study their effective structural, phase
purity and magnetic properties. Prepared nano-sized pure and
doped Ni0.5Zn0.5Fe2O4 were characterized by X-ray diffraction to
investigate the crystalline phase and morphological
characterization analyses, High-resolution transmission electron
microscopy and scanning electron microscopy to confirm the
formation of Ni-Zn ferrite nanoparticle and estimate the particle
sizes, Fourier transforms infrared spectroscopy ensures the
characteristic absorption bands of ferrites, investigate and
confirmed the formation of spinel structure and Vibrating sample
magnetometer to investigate the magnetic induction of the asprepared
sample. X-ray diffraction for pure and doped
Ni0.5Zn0.5Fe2O4 nano-structure confirms the formation of single
phase cubic structure. The estimated crystallite sizes are changes
from 27– 31 nm for the prepared nanomagnetic. SEM and HRTEM
results revealed that pure and doped Ni0.5Zn0.5Fe2O4 nanocrystalline appeared some aggregate nanostructure with
spherical shapes with average size ~29 nm. Infrared absorption
spectroscopy shows the spinel ferrite two absorption bands
corresponding to the tetrahedral and octahedral sites, which are
the significant bands of -Fe2O4 groups, which is due to the
formation of Ni0.5Zn0.5Fe2O4 nano-structure. The saturation
magnetization (Ms) and coercivity (Hc) values were 47.894 and
70.37 G; for pure Ni0.5Zn0.5Fe2O4 nanocrystalline. The values of
both saturation magnetization (Ms) and coercivity (Hc) for the
doped samples were varying according to the type and
concentration of the dopants.