The structural and magnetic properties of the Al cosubstituted cubic spinel ferrite
series MgAlxFe2−xO4 (x = 0.0, 0.4, 0.8, and 1.0) synthesized through
a coprecipitation method were characterized by means of x-ray powder diffraction,
infrared (IR) spectroscopy, transmission electron microscopy (TEM), differential
thermal analyses, and vibrating sample magnetometer. Lattice constants determined
from x-ray diffraction (XRD) measurements exhibit a decrease with increasing
Al3+ ions in the ferrites system. The particle size using TEM was ∼33
nm for magnesium ferrite, which is in good agreement with values obtained by XRD
method. The crystallization spinel formation for the parent ferrite
MgFe2O4 using differential thermal analysis (DTA) technique
was 454 °C. The two main bands observed in the IR spectra (tetrahedral and
octahedral) were in the range (568–628 cm−1) and (431–460
cm−1), respectively. Magnetization curve shows the highest value for the
sample with concentration x = 0.4.