Structural, dielectric properties and AC conductivity of Ni(1−x)ZnxFe2O4 spinel ferrites

Preparation and Characterization of Zinc-Containing Nickel Gallate Ferrite

“…Beyond a specific frequency of the external applied field hopping of electrons is disabled, and polarization decreases to a constant value with increasing frequency. 25 Accordingly, the decrease in the dielectric constant on increasing the frequency is because of the low polarization. Primary losses in ferrites are because of hysteresis and eddy current at the functioning frequency, which is lower than the relaxation frequency of wall dislocation.…”

“…Figure 9 shows e¢ is frequency-independent at temperatures below 330 K and above 480 K. The dependence of e¢ on temperature can be explained on the basis of the existence of dipolar and interfacial polarization, which are sensitive to changes in temperature. 25 On increasing the temperature the charges are accumulated at the grain boundary, which increases the polarization and consequently encourages accumulation of more charges. Figure 10 shows plots of dielectric loss tangent (tan d) as a function of the logarithm of frequency (log f) for the Ni 1Àx Zn x GaFeO 4 spinels in the temperature range 330 £ T £ 480 K. Each column represents one composition (x) and is divided into three plots for three different temperature ranges.…”

Nanocrystalline Nickel Zinc Ferrite as an efficient alcohol sensor at room temperature

“…Where and are the theoretical and experimental densities [20]. Surface morphology of the samples are investigated by Field Emission Scanning Electron Microscopy (FESEM) (FEI, INSPECT F 50) equipped with an energy dispersive x-ray spectrometer system, (configuration no.…”

Electrical and Dielectric Relaxation Characterization of Ni1−x Zn x Ga0.5Fe1.5O4

“…Dipolar and interfacial polarizations which are temperature dependent, cause a sharp increase in the dielectric constant with temperature. This can be interpreted as the increase in charge concentration at the grain boundary enhances the value of polarization which drives more charges to the grain boundary by increasing temperature [27,28]. Figure 8 shows that there are also abrupt changes in (ε ) at temperatures 558, 517, 496, 464, 433, and 405 K for x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, respectively.…”