Yazar "Ates, H" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • Küçük Resim Yok
    Öğe
    In-situ single chamber arc sputtering process for YCd0.3Ba2Cu3O7-? superconducting thin films
    (Kluwer Academic/Plenum Publ, 1999) Yakinci, ME; Balci, Y; Aksan, MA; Aydogdu, Y; Ates, H
    Superconducting YCd0.3Ba2Cu3O7-delta thin films have been deposited in-situ onto single crystal MgO substrates using a DC arc-sputtering process. The depositions were carried out in a single chamber deposition system equipped with two target holders. The films deposited at the optimum condition exhibited strong (001) orientation with a high peak: intensity. The best electrical properties were achieved to be 90 K for T-e, 81K for T-zero and the transport critical current density J(c) = 675 A/cm(2) at 77K and 2.3x10(3) A/cm(2) at 4.2 K for the sample deposited at the optimum conditions.
  • Küçük Resim Yok
    Öğe
    Thermal conductivity properties of Bi2-?Tl?Sr2Ca2Cu3O10+z glass-ceramic HTc superconductor rods
    (Kluwer Academic/Plenum Publ, 1999) Aksan, MA; Yakinci, ME; Balci, Y; Ates, H
    The Glass rods with nominal composition of (Bi2-alphaTlalpha)Sr(2)Ca(2)Cu3O(10+z) where alpha = 0.15, 0.25 and 0.35 have been prepared by melt casting technique. Preferably c-axis oriented grains were grown after the sintering process. The thermal conductivity kappa(T) measurements were performed between 30K and 290K and calculations were mad: using Wiedemann-Franz law. The kappa(T) values of the samples varied between 3.8 to 8.3 mW/cm.K and showed strong dependence to the heating temperatures and compositions. The best T-c and T-zero were obtained to be 122 K and 115 K respectively.
  • Küçük Resim Yok
    Öğe
    Thermal conductivity properties of glass-ceramic (Bi2-?-?Ga?Tl?)Sr2Ca2Cu3O10+x high-Tc superconductors
    (Kluwer Academic/Plenum Publ, 1999) Balci, Y; Yakinci, ME; Aksan, MA; Özdes, A; Ates, H
    Glass-ceramic BSCCO superconductors with nominal (Bi2-delta-gammaGadeltaTlgamma)Sr2Ca2Cu3O10+x compositions, where delta=0.20, 0.40, 0.60 and gamma=0.10, 0.30, 0.40, have been prepared by the melt quenching method. The thermal conductivity, kappa(T) measurements were performed between 30K and 285K and results obtained found to be between 3.1 and 9.9 mW/cm.K depending an the substitution levels and temperature. Results obtained showed that the phonon-defect scattering dominates above the T-c for all samples but below the T-c a strong coupling mechanism occurs. The best electrical performance was obtained to be 113K and 107K for T-c and T-zero, respectively.