Room temperature structural, dielectric, and conductivity properties of Al_<i>x</i>Cd_1-<i>x</i>Fe₂O₄ ferrites

Abstract

The purpose of this study is to investigate dielectric and conduction mechanisms in accordance with composition at room temperature. In this study, AlxCd1-xFe2O4 ferrites with different stoichiometric rates (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5) were prepared through co-precipitation method. The precipitated powder was sintered at 800 degrees C for 8 h to form the pure spinel ferrite nanoparticle. The formation of the cubic spinel phase has been demonstrated by X-ray diffraction analysis. The resulting powder was shown to be nanosized. Experiments were performed at room temperature in the frequency range of 20 Hz to 10 MHz. Frequency-dependent dielectric permittivity and dielectric loss for all examined samples exhibit the dielectric relaxation phenomenon explained by the Maxwell-Wagner polarization. Dielectric constant, AC conductivity, and dielectric loss decreased with increasing frequency. Dielectric constant, dielectric loss, and AC conductivity decreased along with increasing stoichiometric ratio x = 0 to 0.5. However, deviations in the intermediate values were observed, and the values of 0.2 were between 0 and 0.1 and the values of 0.3 were between 0.4 and 0.5. The impedance analysis explained the role of grains and grain boundaries within prepared samples. As a result, it was found that the relaxation process was compatible with the Cole-Cole model.