Conductivity and dielectric studies of copper–aluminate substituted spinel nickel ferrite

Synthesis, microstructure, dielectric and magnetic properties of Cu substituted Ni–Li ferrites

“…The replaced Fe 3 + ions migrate from A-site to the B-site, which increases the concentration of Fe 2 + /Fe 3 + ion pairs at the B-site and therefore the amount of space charge polarization is increased, which leads to increase in the values of dielectric constants. Similar results have been reported for the Li-Ni-Cd, Ni-Cu, Ni-Cu-Al and Li-Mn ferrite systems [18][19][20][21]. Figs.…”

Effect of Ni substitution on the structural and transport properties of NixMn0.8−xMg0.2Fe2O4; 0.0≤x≤0.40 ferrite

“…The ac conductivity is governed by the relation [25][26][27]: The exponent values (s) are calculated as the slope of the straight lines obtained from the relation between ln( ac ) and ln(ω) and reported in Table 1. It is noted that for all samples s decreases with increasing temperature obeying the Correlated Barrier Hopping (CBH) model.…”

Negative magnetization, magnetic anisotropy and magnetic ordering studies on Al3+-substituted copper ferrite

“…To our knowledge few research reports are available on various physical properties of CuAl x Fe 2−x O 4 spinel ferrite system including our recent work on the system [21,25,26,30,32,[48][49][50][51].…”