Electrical conductivity of nickel–zinc and Cr substituted nickel–zinc ferrites

Synthesis, Structural, Electrical, Magnetic Curie Temperature and Y–K Angle Studies of Mn–Cu–Ni Mixed Spinel Nanoferrites

“…The activation energy ( E) of the studied specimens was found in the range 0.16-0.25 (eV) with Table 1 The average crystallite size (t (ave)), lattice constant (a), lattice volume (V ), measure density (ρ m ), X-rays density (ρ x ), porosity (P ), dc electrical resistivity (ρ dc ), activation energy ( E), (1) a maximum value for x = 0.00. The activation energy values are in good agreement with previously reported values for other spinel ferrites [19]. The drift mobility (μ d ) was determined using equation [20]:…”

“…5, it is clear that resistivity decreases with an increase in temperature for all the synthesized samples confirmed with semiconducting behavior. The conduction mechanism in ferrites can be explained by a hopping mechanism [18,19]. The activation energy was determined from the slope of the ln ρ versus (1/k B T ).…”

Effect of Sn–Ni substitution on the structural, electrical and magnetic properties of mixed spinel ferrites

“…The conduction mechanism in ferrites is explained on the basis of hopping of electrons between Fe 2+ and Fe 3+ at octahedral site [33][34][35]. It has been reported that Ni 2+ ions occupy the octahedral (B) site [36] and Sn 4+ ions occupy both the tetrahedral (A) as well as octahedral (B) sites [32,37,38]. When the Ni 2+ replaces the iron ions at the octahedral site then the number of iron ions decrease at (B) site, consequently the number of hopping electrons also decreases causing the electrical resistivity ( ) to increase and drift mobility to decrease.…”

Electrical and magnetic properties of chromium-substituted cobalt ferrite nanomaterials

“…Chromium substituted Ni-Zn, Cd-Co and Al-Cr substituted, Ni-Zn ferrites have been prepared by some researchers using the standard ceramic method [14][15][16]. Some authors have reported the magnetic properties of chromium substituted cobalt ferrite prepared by conventional ceramic method [17][18][19].…”