Browsing by Author "Akdoğan, Mustafa"
Now showing items 1-20 of 42
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Ab initio Hartree-Fock and density functional theory study on characterization of 3-(5-methylthiazol-2-yldiazenyl)-2-phenyl-1H-indole
Büyükuslu, Halim; Akdoğan, Mustafa; Yıldırım, Gürcan; Parlak, Cihan (Pergamon-Elsevier Science Ltd, 2010)The optimized molecular structures, vibrational frequencies, corresponding vibrational assignments, thermodynamic properties, UV-vis spectra and atomic charges of 3-(5-methylthiazol-2-yldiazeny1)-2-phenyl-1H-indole molecule ... -
Ac loss and ramp up related heating effects in superconducting mgb(2) coils
Yetiş, Hakan; Akdoğan, Mustafa; Karaboğa, Fırat; Avcı, Doğan; Belenli, İbrahim (Ieee-Inst Electrical Electronics Engineers Inc, 2020)Superconducting coils modeled by using single core MgB2 wires having copper or iron or both in the cross section as sheath materials have been examined numerically by using the magnetic field formulation and heat transfer ... -
Density functional theory study on the identification of 3-[(2-morpholinoethylimino)methyl]benzene-1,2-diol
Parlak, Cihan; Akdoğan, Mustafa; Yıldırım, Gürcan; Karagöz, Nurettin; Budak, Erhan; Terzioğlu, Cabir (Pergamon-Elsevier Science Ltd, 2011)This study deals with the identification of a title compound, 3-[(2-morpholinoethylimino)methyl]benzene-1,2-diol by means of quantum chemical calculations. The optimized molecular structures, vibrational frequencies and ... -
Design, fabrication, and testing of MgB2/Fe racetrack coils
Karaboğa, Fırat; Yetiş, Hakan; Akdoğan, Mustafa; Gajda, Daniel; Belenli, İbrahim (Ieee-Inst Electrical Electronics Engineers Inc, 2018)We fabricated four superconducting racetrack coils wound by bare in situ MgB2/Fe mono and multifilamentary wires produced in our laboratory by using the wind-and-react method. Transport measurements in self-field were ... -
Diffusion coefficient, activation energy and the effect of Ag-doping on some physical properties of silver doped Bi1.8Pb0.4Ca2.2Sr2Cu3Ox
Akdoğan, Mustafa; Terzioğlu, Cabir; Varilci, Ahmet; Belenli, İbrahim (Elsevier Science Bv, 2010)The aim of the present study is to investigate the effect of diffusion-doped silver on some physical properties of Bi1.8Pb0.4Ca2.2Sr2Cu3Ox superconducting samples and to calculate the diffusion coefficient and the activation ... -
Effect of doping by low content of yttrium at Ca and Sr sites of Bi(Pb)-2212 superconducting ceramics
Amira, Abderrezak; Boudjadja, Y.; Saoudel, A.; Varilci, Ahmet; Akdoğan, Mustafa; Terzioğlu, Cabir (Elsevier, 2011)In this work, a comparative study of the effect of doping bylaw content of Y3+ between (Ca site) and out of (Sr site) the CuO2 planes of Bi(Pb)-2212 phase is presented. Ceramics of Bi1.6Pb0.4Sr2Ca1-xYxCu2O8+d (called CY ... -
Effect of fluorine doping on phase formation and properties of Bi(Pb)-2223 ceramics
Amira, A.; Saoudel, A.; Boudjadja, Y.; Amirouche, L.; Mahamdioua, N.; Varilci, Ahmet; Akdoğan, Mustafa; Terzioğlu, Cabir (Elsevier Science Bv, 2011)Superconducting ceramics of Bi1.6Pb0.4Sr2Ca2Cu3OyFx (x = 0-0.6) are prepared in air by conventional solid state reaction and characterized. The study shows that the melting point of the samples decreases as fluorine content ... -
Effect of Mn addition on structural and superconducting properties of (Bi, Pb)-2223 superconducting ceramics
Yıldırım, Gürcan; Bal, S.; Yücel, Ersin; Doğruer, Musa; Akdoğan, Mustafa; Varilci, Ahmet; Terzioğlu, Cabir (Springer, 2012)This study deals with the effect of Mn addition on the structural and superconducting properties of Bi1.8Pb0.4Sr2Mn (x) Ca2.2Cu3.0O (y) ceramics with x=0,0.03,0.06,0.15,0.3 and 0.6 by means of X-ray analysis (XRD), scanning ... -
The effect of Sm → Ca substitution on mechanical properties of BSCCO superconductors
In order to investigate the effects of Sm substitution on the mechanical properties of Bi-Pb-Sr-Ca-Cu-O, Bi1.6Pb0.4Sr 2Ca2-xSmxCu3Oy superconductors with x = 0.0, 0.0005, 0.001, 0.005, 0.01, 0.1, 0.5, 1.0, 1.5 were prepared ... -
Effect of the initial filling density on the critical current of in-situ Fe/MgB2 wires
Akdoğan, Mustafa; Yetiş, Hakan; Gajda, Daniel; Karaboğa, Fırat; Ülgen, Asaf Tolga; Demirtürk, Emine; Belenli, İbrahim (Elsevier Science Sa, 2015)We report a comparative study on the fabrication of in-situ monofilamentary superconducting Fe sheathed MgB2 wires as a function of the initial tube filling density. The wire samples are fabricated by means of a standard ... -
The effect of the number of Ag layers on some physical properties of Bi1.8Pb0.4Ca2.2Sr2Cu3Ox
Akdoğan, Mustafa; Erdem, M.; Terzioğlu, Cabir; Belenli, İbrahim (Springer, 2012)Bi1.8Pb0.4Ca2.2Sr2Cu3Ox/Ag multilayered samples with 2, 4 and 8 layers are prepared by powder in tube (PIT) method and the effect of multilayering with Ag on the superconducting and the microstructural properties of ... -
Effects of mg-coating and boron type on electromechanical properties of IMD MgB2/Fe wires
Avcı, Doğan; Yetiş, Hakan; Karaboğa, Fırat; Akdoğan, Mustafa; Belenli, İbrahim (Springer, 2021)In this study, mechanical and electrical characterization measurements were performed on non-bent and gradually bent IMD MgB2/Fe superconducting round wires having 0.81 mm outer diameter. Four straight IMD wires were ... -
Electrical and structural properties of RE3Ba5Cu8O18 (RE=Y, Sm and Nd) superconductors
Topal, Uğur; Akdoğan, Mustafa; Özkan, Hüsnü (Springer, 2011)This paper presents the synthesis and characterization of the new superconducting compounds with nominal composition, RE3Ba5Cu8O18, RE=Y, Sm and Nd. The onset critical temperatures of the present samples are 97.5, 97 and ... -
Experimental and theoretical approaches on magnetoresistivity of Lu-Doped Y-123 superconducting ceramics
Türköz, Mustafa Burak; Nezir, Saffet; Varilci, Ahmet; Yıldırım, Gürcan; Akdoğan, Mustafa; Terzioğlu, Cabir (Springer, 2013)This study discusses the change of the flux pinning mechanism, electrical and superconducting properties of Lu added YBa2Cu3O7-delta bulk superconducting ceramics prepared by the liquid ammonium nitrate and derivatives at ... -
Experimental and theoretical studies on the identification of p-biphenyloxycarbonylphenyl acrylate
Çetin, Sedat; Yıldırım, Gürcan; Parlak, Cihan; Akdoğan, Mustafa; Terzioğlu, Cabir (Pergamon-Elsevier Science Ltd, 2011)This study presents the identification of a title compound, p-biphenyloxycarbonylphenyl acrylate by means of experimental and theoretical evidences. The spectroscopic properties of the compound were experimentally investigated ... -
Fabrication and characterization of C15H12O2 doped MgB2 bulk superconductors
Ağıl, Hasan; Yetiş, Hakan; Akdoğan, Mustafa; Altuğ, Cevher; Aktürk, Selçuk (Elsevier Sci Ltd, 2014)The synthesis and characterization of bulk MgB2 superconductors doped with various amounts of organic compound C15H12O2 are reported. We prepared MgB2 + C15H12O2 samples by means of wet-mixing process in ethyl toluene. A ... -
First-principles calculations on vibrational and dielectric properties of chalcopyrite CuGaS2
Akdoğan, Mustafa; Eryiğit, Resul (Iop Publishing Ltd, 2002)We have performed a first-principles study of structural, dynamical and dielectric properties of chalcopyrite semiconductor CuGaS2.(.) The calculations have been carried out within the local density functional approximation ... -
Formation of high-field pinning centers in superconducting MgB2 wires by using high hot isostatic pressure process
Gajda, Daniel; Morawski, Andrzej; Zaleski, Andrzej Janusz; Akdoğan, Mustafa; Yetiş, Hakan; Karaboğa, Fırat; Belenli, İbrahim (Springer, 2017)This paper demonstrates the effects of hot isostatic pressure (HIP) on the structure and transport critical parameters of in situ MgB2 wires without a barrier. Our results show that only HIP and nano-boron allow the formation ... -
Further increase of T (c) in y-ba-Cu-O superconductors
Topal, Uğur; Akdoğan, Mustafa (Springer, 2011)This paper presents the synthesis and characterization of three new Y-based high temperature-superconducting compounds having relatively higher transition temperature T (c) compared with that of the Y-123, Y-124, and Y-247. ... -
Improvement of in-situ Fe/MgB2 monofilamentary wires by internal Mg-coating process
Karaboğa, Fırat; Avcı, Doğan; Yetiş, Hakan; Akdoğan, Mustafa; Gajda, Daniel; Belenli, İbrahim (Elsevier Science Sa, 2017)In the present work, we have studied on the use of internally Mg-coated and uncoated iron tubes in processing of in-situ mono filamentary Fe/MgB2 wires by means of transport measurements and structural analysis methods. ...
