التفاصيل البيبلوغرافية
| العنوان: |
Comprehensive Analysis of Optical, Dielectric, and Electrical Properties in Al- and Cu-Doped Barium Hexaferrite/Cobalt–Zinc Ferrite Hybrid Nanocomposites. |
| المؤلفون: |
Sudhakaran, Allwin, Sudhakaran, Ashwin, Sivasenthil, E. |
| المصدر: |
Journal of Electronic Materials; Aug2024, Vol. 53 Issue 8, p4622-4644, 23p |
| مصطلحات موضوعية: |
BARIUM ferrite, DIELECTRICS, ZINC ferrites, NANOCOMPOSITE materials, PERMITTIVITY, ENERGY dissipation |
| مستخلص: |
This manuscript presents a comprehensive study on the optical, dielectric, and electrical properties of Al- and Cu-doped barium hexaferrite/cobalt–zinc-ferrite hybrid nanocomposites. The main objective of the study is to investigate how the concentration of two different materials, namely BaFe12−0.5Al0.5O19 and BaFe12−0.5Cu0.5O19, affects the optical, dielectric, and electrical properties in the production of a composite material or the influence of Co0.6Zn0.4Fe2O4. The optical behaviour of the nanocomposite was investigated using UV–visible spectroscopy to obtain the absorption spectra. The dielectric and electrical behaviour was extracted from the absorption spectra, and the electrical properties of the nanocomposites were calculated using a simple theoretical model that requires only two parameters: the effective mass of the charge carriers and the activation energy determined from the Urbach and dielectric constants. The results show that the concentration of the hard-phase BaFe12−xMxO19 (M = Al, Cu) significantly influences the physical properties. The optical density showed peaks at 450 nm and 550 nm for the Al- and Cu-doped nanocomposites, indicating differences in their electronic structure. The skin depth showed an initial decrease followed by an increase, with minimum values of 400–500 nm and 500–600 nm for the two composites, respectively. The refractive index of 3.0–3.4 corresponds to semiconductors such as mercury sulphide and silicon and enables optoelectronic applications. The high transmittance of 400–800 nm is also suitable for temperature control and radiation shielding of spacecraft. By adjusting the BaFe12−xMxO19 concentration, the refractive index and reflectivity can be adjusted. Increased optical conductivity in the visible range reveals potential as an optical conductor. The dielectric constant and the loss factor also change with the composition, which enables the dielectric behaviour to be tuned. The real part of the dielectric constant increased exponentially while the imaginary part peaked around 2.2–2.8 eV, related to inter-band transitions. Both composites showed positive dielectric loss at higher energies, suggesting relaxation phenomena. Overall, the multifunctional nanocomposite holds promise for various applications including optoelectronics, photocatalysis, sensing, and rewritable memory that require low saturation magnetization and coercivity. The findings contribute to the development of advanced materials with desirable properties for modern technological applications. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
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