“…The barrier that is generated by grain boundaries can, on the other hand, make the hopping of electrons more difficult, which may lead to a reduction in conduction. This process causes charge carriers to accumulate at grain boundaries, which in turn generates space charge polarization [ 64 ]. Fig.…”
Section: Resultsmentioning
confidence: 99%
“…8 (b). The decrease in conductivity as the concentration of Mg 2+ ions increase can be explained by the greater number of Mg 2+ cations, which hinder the conduction between Fe 3+ ↔ Fe 2+ ions because Mg 2+ ions occupy an octahedral site [ 64 ]. Since grain borders are more active than grains, the hopping phenomena between Fe 2+ and Fe 3+ ions decrease in the low-frequency regime, leading to reduced conductivity values.…”
“…The barrier that is generated by grain boundaries can, on the other hand, make the hopping of electrons more difficult, which may lead to a reduction in conduction. This process causes charge carriers to accumulate at grain boundaries, which in turn generates space charge polarization [ 64 ]. Fig.…”
Section: Resultsmentioning
confidence: 99%
“…8 (b). The decrease in conductivity as the concentration of Mg 2+ ions increase can be explained by the greater number of Mg 2+ cations, which hinder the conduction between Fe 3+ ↔ Fe 2+ ions because Mg 2+ ions occupy an octahedral site [ 64 ]. Since grain borders are more active than grains, the hopping phenomena between Fe 2+ and Fe 3+ ions decrease in the low-frequency regime, leading to reduced conductivity values.…”
“…This is in good agreement with previous results. [25,26] Figure 8 shows the ferromagnetic resonance (FMR) linewidth (∆H) of Lorentz fitting to NiCuZn ferrites with different Bi 2 O 3 -CuO additives. The ∆H values for different CuO additives are shown in Fig.…”
With a series of 1.0 wt%Bi2O3–x wt% CuO (x = 0.0, 0.2, 0.4, 0.6, and 0.8) serving as sintering additives, Ni0.23Cu0.32Zn0.45Fe2O4 ferrites are successfully synthesized at a low temperature (900 °C) by using the solid state reaction method. The effects of the additives on the phase formation, magnetic and dielectric properties as well as the structural and gyromagnetic properties are investigated. The x-ray diffraction (XRD) results indicate that the added Bi2O3–CuO can lower the synthesis temperature significantly without the appearing of the second phase. The scanning electron microscope (SEM) images confirm that Bi2O3 is an important factor that determines the sintering behaviors, while CuO affects the grain size and densification. With CuO content x = 0.4 or 0.6, the sample shows high saturation magnetization, low coercivity, high real part of magnetic permeability, dielectric permittivity, and small ferromagnetic resonance linewidth (ΔH). The NiCuZn ferrites are a promising new generation of high-performance microwave devices, such as phase shifters and isolators.
Polymer networks incorporated with iron and zinc oxide nanoparticles have superparamagnetic and electrical characteristics where it can be employed in a variety of significant applications. To achieve optimal distribution and connection of nanoparticles in various polymeric matrices, it is required to investigate their dispersion performance with varied contents and the impact on their physical characteristics. A controlled sol-gel method is used combined with gel casting to synthesize organic-inorganic nanocomposites of (ZnO)x(1 − x)Fe2O3 loaded within a polystyrene-polyethylene glycol matrix. The structural and morphological assembly of the hydrogen bonds between the inorganic and organic parts is verified using X-ray diffraction (XRD) and scanning/transmission electron microscope (SEM/TEM) for the synthesized nanocomposites. The existence of the Fe aggregates, Zn/Fe pairs, and organic molecules was also confirmed by FTIR spectra. Optical and magnetic properties were evaluated. The band gap, refractive index, optical dielectric constant, and optical electronegativity were extracted.
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