Abstract:
Hydrothermal method was used for the preparation of Aluminum substituted
Nickel ferrites (NiAlxFe2-xO4, x= 0.0, 0.1, 0.2) to study the effect of substitution of Al
on structural, magnetic and electrical properties of Nickel ferrite. X-ray diffraction,
Scanning Electron microscopy, Energy Dispersive spectrum, Fourier Transmission
Infrared spectroscopy (FTIR), Vibrating sample magnetometer (VSM) and Two Probe
technique was used to characterize the samples. A single phase spinal structure was
confirmed by XRD diffraction and lattice parameter was reduced from 8.40 Å to 8.25
Å.SEM micrographs showed nanoparticles are agglomerated and are non-uniform in
size.EDX analysis confirmed that substitution has been successfully achieved. The
FTIR spectrum revealed the absorption band of octahedral site is around 650 cm-1
for
pure Nickel ferrite and this band shifted toward higher frequency with increasing the
Al content because substitution of Al reduces the bond length. The M-H loop justified
that substitution of nonmagnetic Al+3 (0μB) decreased the Saturation magnetization
(Ms) and increased the Coercivity (Hc). The substitution of Al increased the resistivity
of the Nickel ferrite which will make the material suitable for high frequency
applications and where low eddy current losses are desirable
