Effect of Tungsten (W) Substitution on the Physical Properties of Bi-(2223) Superconductors


Turk N., Gundogmus H., AKYOL M. , Yakinci Z. D. , EKİCİBİL A. , ÖZÇELİK B.

JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, cilt.27, ss.711-716, 2014 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 27 Konu: 3
  • Basım Tarihi: 2014
  • Doi Numarası: 10.1007/s10948-013-2351-9
  • Dergi Adı: JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
  • Sayfa Sayısı: ss.711-716

Özet

The superconducting Bi1.6Pb0.4Sr2Ca2Cu3-x W (x) O10+y (x=0.00, 0.05, 0.10, 0.15) bulk samples were prepared by the solid-state reaction method. The effects of W substitution on the BSCCO system have been investigated by the electrical resistivity (rho-T), scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), magnetic hysteresis and critical current density measurements. It has been found that the Bi-(2212) low-T (C) phase is formed for all the substitution levels, together with the Bi-(2223) high-T (C) phase. The results obtained from the XRD data show that the Bi-(2223) phase gradually transforms into the Bi-(2212) phase with increasing W substituting for Cu. In addition, from the magnetization measurements at the temperatures below the zero resistance temperatures of the samples, we have observed that a decreasing in magnitude of |M| with the increasing measurement temperature and W concentration. Therefore, the decreasing of |M| related to superconducting volume seems to imply an existence of flux-pinning centers in our samples.

The superconducting Bi1.6Pb0.4Sr2Ca2Cu3-x W (x) O10+y (x=0.00, 0.05, 0.10, 0.15) bulk samples were prepared by the solid-state reaction method. The effects of W substitution on the BSCCO system have been investigated by the electrical resistivity (rho-T), scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), magnetic hysteresis and critical current density measurements. It has been found that the Bi-(2212) low-T (C) phase is formed for all the substitution levels, together with the Bi-(2223) high-T (C) phase. The results obtained from the XRD data show that the Bi-(2223) phase gradually transforms into the Bi-(2212) phase with increasing W substituting for Cu. In addition, from the magnetization measurements at the temperatures below the zero resistance temperatures of the samples, we have observed that a decreasing in magnitude of |M| with the increasing measurement temperature and W concentration. Therefore, the decreasing of |M| related to superconducting volume seems to imply an existence of flux-pinning centers in our samples