Electrical and Magnetic Properties of NiZn Ferrite Prepared by Conventional and Solar Sintering

Abstract

The electrical properties of polycrystalline NiZn ferrite, Zn 0.44 Ni 0.38 Fe 2.18 O 4 , were investigated by impedance spectroscopy over the frequency and temperature ranges, 5 Hz to 2 MHz and 10 to 600 K and by magnetic permeability measurements at room temperature. Samples were sintered in either conventional or solar furnaces followed by quenching or slow cooling to ambient temperature. Depending on processing conditions, the room temperature electrical resistivity of conventionally-sintered samples varied by seven orders of magnitude, from 5 ohm cm for a sample Samples sintered in the solar furnace were much more conductive than ones that were slowcooled after conventional sintering and this is attributed to the relatively rapid cooling rate after exposure in the solar furnace, which preserved some of the oxygen deficiency present at high temperature. For the same reason, samples that were slow cooled in N 2 were also much more conductive. For conventionally-sintered samples of similar density, quenched samples had much higher imaginary permeability, attributed to their lower resistivity and higher eddy currents, than slow-cooled samples. Solar-sintered samples had higher real permeability than slow-cooled, conventionally-sintered ones mainly due to a combination of their lower resistivity and higher density, 96% compared to 86%.

Effect of Pr on the electrical and chemical properties of cerium oxide prepared by combustion method

“…The values of total resistance, capacitance and total conductivity were obtained by adjusting the complex impedance spectra with an equivalent circuit, which consists of two parallel RC elements connected in series as shown in Figure . Where R is the resistance to charge transfer and can be represented by the bulk and grain boundaries resistance, which are superimposed on the Nyquist diagrams, and C is the capacitance which is due to the accumulation of charge carriers in the materials . The correlation values are shown in Table , and states that the equivalent circuit for the capacitor is close to the ideal.…”

Study of the Effect of Quenching on Microstructural and Magnetic Properties of Cu-Doped Mg-Ferrite

“…e cation distribution of ferrite is influenced by many factors such as the synthesis method, cations substitution, and postpreparation heat treatments [7][8][9]. Moreover, the cooling rate from high temperatures can change the cation distribution of the ferrites, leading to modifying the room temperature phase distribution, microstructure, and magnetic properties [10][11][12][13][14][15].…”

Synthesis of Zinc - Bismuth Complex Oxide and Experimental Analysis of Its Magnetic and Electrical Characteristics

“…And the atomic and distribution in the sample are determined by the scattering intensity and angular distribution. In order to obtain the lattice distance of the sample, the angle of incidence and the wavelength should be changed [7]. According to the same method, the measurement is also the same with that of the distance between the incident and the wavelength.…”