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  • Küçük Resim
    Öğe
    The Effect of Sm → Ca Substitution on Mechanical Properties of BSCCO Superconductors
    (Physical Soc Republic China, 2007) Yilmazlar, M.; Öztürk, O.; Aydin, H.; Akdogan, M.; Terzioglu, C.
    In order to investigate the effects of Sm substitution on the mechanical properties of Bi-Pb-Sr-Ca-Cu-O, Bi1.6Pb0.4Sr2Ca2-xSmxCu3Oy superconductors with x = 0.0, 0.0005, 0.001, 0.005, 0.01, 0.1, 0.5, 1.0, 1.5 were prepared by standard solid-state reaction methods. The mechanical properties of these compounds have been investigated by measuring the Vickers hardness, yield strength, porosity, and SEM. These measurements showed that the Vickers hardness, yield strength, and porosity increased gradually with increasing Sm concentration.
  • Küçük Resim
    Öğe
    Thermal expansion and Vickers hardness measurements on Bi1.6Pb0.4Sr2Ca2−xSmxCu3Oy superconductors
    (Elsevier Science Bv, 2006) Yılmazlar, M.; Çetinkara, H. A.; Nursoy, M.; Öztürk, O.; Terzioğlu, C.
    In this work, Bi1.6Pb0.4Sr2Ca2-SmxCu3Oy (x = 0.0000, 0.0005, 0.0010, 0.0050, 0.0100, 0.1000, 0.5000, 1.0000, 1.5000) superconductors were prepared by conventional solid-state reaction method. The effect of the substitution of Sm for Ca in the high-T-c phase Bi-2223 was investigated by DTA, thermal expansion coefficient, Vickers microhardness, XRD and SEM analysis. The lattice constants and volume fractions are estimated from XRD analysis. The thermal expansion coefficient, the microhardness, the volume fraction, and the lattice constants strongly depend on the Sm content of the samples. XRD data show that the high-Tc phase decreases and the low-T-c phase increase as the Sm substitution changes from x = 0.0 to 1.5. The coefficients of thermal expansion (in the range of 30-800 degrees C) of the pure (x = 0.0) and high doped (x = 1.5) samples were 7.90 x 10(-7) and 5.70 x 10-7 degrees C-1, respectively. The results of Vickers hardness measurements varied between 0.254 and 0.623 GPa as increasing the Sm concentration. (c) 2006 Elsevier B.V. All rights reserved.