The influences of Zn2+ and some rare-earth ions on the magnetic properties of nickel–zinc ferrites

Development of Ni–Zn nanoferrite core material with improved saturation magnetization and DC resistivity

“…As the temperature gradually increases from 800 to 1300 1C, the dc electrical resistivity steeply increases up to 1100 1C and falls sharply later. It has been observed a reasonable value of electrical resistivity at lower sintering temperatures than that of earlier available reports ( Table 2) [33][34][35][36][37][38]. It has been reported that highest value of dc electrical resistivity in sol-gel synthesized Ni-Zn ferrite samples embedded in silica matrix at higher sintering temperatures [39].…”

Characterization of nanocrystalline NiCuZn ferrite powders synthesized by sol–gel auto-combustion method

“…It is also evident from Fig. 4 that the sintering temperature (≈900 • C) of the ferrite, is much lower than that (>1100 • C) of powders prepared by the conventional solid-state reaction method (Sun et al, 2004). The lattice parameter (Table 1) was found to increase with increasing Zn 2+ substitution of the ferrite.…”

Structural, dynamic magnetic and dielectric properties of Ni0.15Cu0.2Zn0.65Fe2O4 ferrite produced by NaOH co-precipitation method

“…As seen in the figure, ρ declines slowly with the sintering temperature before 1000 • C, corresponding to the growth of the grain size, and rises when the sintering temperature exceeds 1000 • C. This is assumed to be the result of the appearance of the liquid-like particles on the grain boundaries. When the sintering temperature arrives at 1300 • C, the ρ value decreases because of the volatilization of Zn which brings the Fe 2+ [19,20]. However, the ρ value continues to rise for the sample F at 1 MHz.…”

“…This results in the formation of Fe 2+ ions [19,20]. Under this circumstance, the dispersion of ε can be ascribed to the presence of simultaneous contributions of two different types of charge carriers to the polarization: n-type as electron transfers caused by Fe 2+ and p-type as hole transfers caused by the grain boundaries.…”