Structural and electrical properties of nano-sized magnesium aluminate

926-933The effects of temperature, frequency, and molarity on the dielectric behaviour and ac electrical conductivity have been studied for nanosized samples of MgAl2O4 prepared by chemical co-precipitation technique. X-ray powder diffraction (XRD) study shows that the particle size is 8 nm and the system is orthorhombic. FTIR studies have been used to confirm the formation of the resultant compound. The variations of dielectric constant (ε'), the loss tangent (tanδ) as a function of frequency (200 Hz – 4 MHz) and the temperature (303-450 K) have also been studied. The experimental results indicate that the real dielectric constant (ε'), tanδ, and logσ increase with temperature and then decrease. The dielectric constant (ε'), and tanδ, decrease while the ac conductivity (σac) increases as the frequency increases