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الابحاث العلمية للطلاب |Students Research Articles

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يعرض هذا القسم الأبحاث المقبولة للنشر ضمن مبادرة نشر الأبحاث للطلبة في المجلات ذات التأثير المرتفع و التي اطلقتها عمادة البحث العلمي

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Browsing الابحاث العلمية للطلاب |Students Research Articles by Author "A. Baykal"

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    Fabrication of exchange coupled hard/soft magnetic nanocomposites: Correlation between composition, magnetic, optical and microwave properties
    (2021) Y. Slimani; N.A. Algarou; M.A. Almessiere; A. Sadaqat; M.G. Vakhitov; D.S. Klygach; D.I. Tishkevich; A.V. Trukhanov; S. Gأ¼ner; A.S. Hakeem; I.A. Auwal; A. Baykal; A. Manik; an; I. Ercan
    This paper studied the exchange coupling performance beside structural and microwave properties of SrFe12O19 (SFO) and x(CoTm0.01Tb0.01Fe1.98O4) (CoTmTb) (xآ â‰¤آ 3.0) hard/soft ferrites nanocomposites (NCs). The structure and morphology of NCs were investigated by XRD
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    Structural and magnetic properties of hydrothermally synthesized Bi-substituted Ni–Co nanosized spinel ferrites
    (2022) Ameerah, N. Alqarni; Munirah Almessiere; Murat Sertkol; M. Sertkol; Sagar, E. Shirsath; N. Tashkandi; A. Baykal
    In this study, the structural, morphological, and magnetic properties of hydrothermally synthesized Co0.5Ni0.5BixFe2-xO4 (x=0.00–0.10) nanosized spinel ferrites, (CoNiBiFO (x=0.00–0.10) NSFs), were investigated. The formation of CoNiBiFO NSFs phase was confirmed by X-ray diffraction (XRD). Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed the morphology of the NSFs. Magnetization revealed that undoped Co0.5Ni0.5Fe2O4 and Co0.5Ni0.5BixFe2-xO4 NSFs (except with x = 0.04) exhibit ferrimagnetic magnetism at 300 K. Only the hysteresis loops recorded from Co0.5Ni0.5Bi0.04Fe1.96O4 NSFs have superparamagnetic characteristics. Mixed Co0.5Ni0.5Fe2O4 NSFs have maximum remnant magnetization (Mr) of 23.5 emu/g, maximum saturation magnetization (MS) of 63.38 emu/g, and maximum magneton number (nB) 2.66 μB. However, Co0.5Ni0.5Bi0.04Fe1.96O4 NSFs have minimum MS of 28.25 emu/g and minimum nB as 1.22 μB among Bi3+ doped and undoped samples. The coercivity (HC) of undoped Co0.5Ni0.5Fe2O4 NSFs is 656 Oe. However, the Bi3+ ion-doped samples have a wide range of HC values between 101 Oe and 1038 Oe. The squareness ratios are in the range of 0.092–0.418 and multi-domain structure is assigned for all types of samples. The measured positive exchange bias (HE) magnitudes are 268 Oe and 290 Oe, respectively. Hysteresis loops recorded at 10 K proved that the products are ferrimagnetic. These coercivities showed that all the samples are magnetically harder at low temperatures. Positive HE values of 165 Oe and 297 Oe were measured from the nanoparticles (NPs) with x = 0.08 and x = 0.10 at 10 K. The SQR of the Co0.5Ni0.5Bi0.04Fe1.96O4 sample at 10 K is almost equal to the critical value of 0.5, and a single domain structure with uniaxial symmetry can be attributed for this sample. The other samples have SQRs in the range of 0.632–0.782 and multi-domain wall structure is assigned for them at 10 K.
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    Synthesis and design of vanadium intercalated spinal ferrite (Co0.5Ni0.5VxFe1.6−xO4) electrodes for high current supercapacitor applications
    (2022) Ameerah Alqarni; E. Cevik; M. A. Gondal; M. A. Almessiere; A. Baykal; A. Bozkurt; Y. Slimani; M. Hassan; A. Iqbal; Sarah, A. Alotaibi
    Supercapacitors are promising energy storage systems as they offer low cost, high cyclic stability, and high-power density. However, at high currents, due to high voltage drops they show a consequent low energy density and irregular stability problems. Herein, we demonstrate a device that addresses these problems by vanadium-doped Co-Ni spinel ferrite nanoparticles (SFNP) (Co0.5Ni0.5VxFe2−xO4) where x = 0.00, 0.04, 0.08 and 0.10 into an activated carbon-based nanocomposite electrode. The fabricated supercapacitor device showed a successful energy density retention at high current without losing power density and cyclic stability. The device containing SFNPs based composite electrodes was achieved a specific energy of 57.24 Wh kg−1 at a specific power of 7.900 W kg−1 with excellent cyclic stability of 10,000 cycles. The prototype device was successfully powered RGB LED light. The low-cost production of materials and high electrochemical performance may pave the way for using these nanocomposites for highly stable energy storage devices.