Synthesis and Characterization of (MoO3 / NiAl2O4) Nanocomposites and Studying Their Structural, Electrical and Magnetic Properties

Abstract

(MoO3 / NiAl2O4) composite was prepared by ceramic method and calcined at (450 ̊C, 550 ̊C and 650 ̊C). The effects of the annealing temperature on the structural, magnetic and electrical properties of the samples were studied by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), vibrating sample magnetometry (VSM) and LCR-meter. XRD tests proved that the grain size values of phases are ranged between (55.34 and 58.68nm), as it is shown that a temperature of (550 ̊C) leads to the disappearance of (MoO3) phase and the emergence of new (NiMoO4) phase and this shows that the degree of heating increased the granular size.

The results of the FESEM of (MoO3 / NiAl2O4) showed that the particle size values increased with the appearance of new phases. VSM tests proved that when increasing the amount of nickel and reduce the amount of alumina in nanocomposites, there is an increase in magnetic saturation (Ms) and this increase is irregular and leads to an increase in crystals size. The results of dielectric tests showed the emergence of the highest peak of the real and imaginary dielectric constant, at the lowest frequency which decreases with increasing frequency at low frequencies.