The role of Mo6+ ion substitution on the electrical and dielectric features of SrNi-hexaferrites

The Mo6+ ions-doped SrNi-hexaferrites, Sr0.8Ni0.2MoxFe12-2xO19 (x & LE; 0.35) HFs, were manufactured by sol-gel approach. Microstructure was analyzed through XRD, SEM-EDX, TEM, and HR-TEM. The effect of Mo6+ ions substitution on the electric-dielectric features of SrNi-HFs has been studied versus frequency and at different temperatures by impedance spectroscopy technique. It has been pointed out that the ac conductivity obeys the power law rule of f, and it is found that the dependencies of both T and substitution ratios in SrNi-HFs are highly influential for grains and grain boundaries. The levels of activation (E-a) determined from dc electrical conductivity fluctuate with the Mo6+ ion substitution into SrNi-HFs implying that the mechanism of conduction is due to the contribution of both polaron and electron hopping. The dielectric parameters were found to be f dependent at T up to 120 & DEG;C for various Mo6+ substitution ratios. The complex impedance of Cole-Cole plots shows a semicircle of different dimensions that depend on T, indicating that the resistive and capacitive responses of SrNi-HFs are because of the contribution of grain boundaries and grains formed in the HFs` structures. It has been detected that although the Mo6+ ion substitution creates relatively small differences on grain resistance, it causes a notable change in grain boundary resistance in the SrNi-HFs` system.

Automated summary

The Mo6+ ions-doped SrNi-hexaferrites were prepared using the sol-gel approach, and their microstructure was analyzed by XRD, SEM-EDX, TEM, and HR-TEM. The effect of Mo6+ ion substitution on the electric-dielectric features of SrNi-hexaferrites was studied using impedance spectroscopy technique. It was found that the ac conductivity follows a power law rule and that the substitution ratios and temperatures have a significant influence on the grains and grain boundaries of SrNi-hexaferrites.