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    Öğe
    Electromagnetic wave absorption in polyaniline coated Y3Fe5O12/Carbon-Black hybrid composites
    (Elsevier Science Sa, 2024) Akyol, Mustafa; Altay, Melek; Parajuli, Saroj; Teksen, Fikret Alpay; Karaaslan, Muharrem
    Y3Fe5O12(YIG)(1-x)/Carbon-Black(CB)(x) (0.00 <= x <= 1.00; 0.25 steps) coated with polyaniline (PANI), forming a core-shell structure, were synthesized by in-situ polymerization following sol-gel and solid-state reactions. The crystalline, surface morphology and magnetic properties of YIG(1-x)/CBx and PANI@YIG(1-x)/CBx hybrid composites were studied using X-ray diffraction (XRD), scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM), respectively. Electromagnetic wave (EMW) absorbing properties were investigated by measuring dielectric parameters in the 2-18 GHz frequency range. The reflection loss (RL), impedance matching, and loss tangent were studied in detail. The electromagnetic wave absorbing mechanisms were discussed by considering dielectric and magnetic losses, as well as microstructural properties of the samples. The EMW absorbing performance of the YIG(1-x)/CBx composites showed a broadband absorption property (7.0 GHz bandwidth at -10 dB reflection loss value) in YIG(0.75)/CB0.25 composite. When the composites are covered with conductive PANI, the EMW absorbing performance is enhanced in terms of RL (minimum -36.5 dB) and effective absorption bandwidth (EAB) (maximum 10.2 GHz at -10 dB) values due to increasing scattering probability, interfacial polarization and conduction loss of the penetrated EMW. The results showed that a wider absorption frequency range could be obtained by coating PANI on YIG/CB composite.
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    Öğe
    Structural, magnetic and optical characterization of BiFe1-xCrxO3 (x = 0.0, 3.3, 6.6 and 10 %) nanoparticles
    (Elsevier, 2026) Parajuli, Saroj; Irfan, Muhammad; Akyol, Mustafa
    In this study, BiFe1-xCrxO3 (x = 0.0, 3.3, 6.6 and 10 %) nanoparticles were synthesized using a modified sol-gel route, which produces nanostructured materials with high purity and homogeneity, as well as the ability to modify the size and shape of the resultant particles. In-depth analyses of the samples' optical, magnetic, elemental and structural characteristics were carried out. X-ray diffraction (XRD) experimental data indicate that BiFe1-xCrxO3 nanomaterials exhibit a deformed perovskite structure with rhombohedral symmetry and an R3c space group. All samples displayed ferromagnetic behavior due to the disruption of spiral spin structures and alterations in superexchange interactions, linked to the bond length of Fe-O and Fe-O-Fe. The optical band gap energy values of BiFe1-xCrxO3 materials are found from 2.56 eV to 2.82 eV based on Cr content in the main lattice. Controlling the optical band gap through Cr-substitution in BFO nanostructures can make them suitable for solar applications.