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    Electromagnetic properties in the structure of Cerium-Copper substituted barium hexaferrite
    (Elsevier, 2022) Yener, Tuba; Araz, Isa; Kirsoy, Ahmet; Yalcin, Orhan; Okutan, Mustafa; Bolivar, Peter Haring
    In this study Ce3+ -Cu2+ doped barium hexaferrite Ba-0.5 Ce0.5CuFe11O19 composite sample was synthesized by a conventional method and barium hexaferrites/CeO2 phase composition, X-Ray Diffractometer were examined. Sample morphology was observed by SEM. A VSM was used to analyze the magnetic properties of the ferrites. Complex permittivity, permeability, reflection loss, absorption loss and shielding effectiveness were analyzed by using a VNA measuring the transmission/reflection coaxial airline method. The phase changes of the crystal structure because of the effect of Ce3+ ions into Ba2+ site and Cu2+ ions into Fe3+ areas were investigated. The resulting composition in these two resonance phases has a maximum absorption loss value at similar to 6.48 GHz and similar to 11.25 GHz and a maximum reflection loss value at the same frequencies. In this synthesized composition structure, it has been observed that it has a maximum reflection loss value of approximately -22.2dB and the highest shielding effectiveness value of 33.3 dB at microwave frequency 11.25 GHz. (c) 2022 Elsevier B.V. All rights reserved.
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    Equivalent device and optical band gaps analysis of acidic red dye imprinted hydrogels
    (Springer, 2022) Coskun, Ramazan; Okutan, Mustafa; Yalcin, Orhan; Ozturk, Muhittin; Kirsoy, Ahmet; Oncan, Mehmet
    Structural, optical and dielectric properties of high quality hydrogels with different doses acidic red dye imprinted were successfully analyzed in detail in this work into provide important information about the technological applications. Absorbance spectra and their energy band gaps for the acidic red dye imprinted hydrogels have been analyzed with UV spectroscopy. The complex dielectric constant, the tangent/dissipation factor (tan delta), the complex impedance, the capacitance and the complex electric modulus were measured in the frequency range of 100 Hz to 40 MHz at room temperature. It has been determined that the peak values of the tangent value in the AR doped samples in the high frequency region are due to the anionic dye effect, unlike the cationic dye doped samples. The dominant effects such as the complex dielectric constant and electric modulus in high frequency region for acidic red dye imprinted hydrogels have been attributed to the Maxwell-Wagner theory, the basis of Kroop's approach and the ionic conductivity. Experimental plane plots (Cole-Cole plots) of the complex dielectric constant, impedance and electric modulus for different doses acidic red dye imprinted hydrogels were obtained. In order to analyze the suitability of the samples for electrical circuit applications, the equivalent electrical circuit corresponding to the Cole-Cole plots for the complex electric modulus was calculated and adapted with Smith Chart.