Effect of K substitution on Structural, Electrical and Magnetic Properties of Bi-2212 system


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ÖZÇELİK B. , GÜRSUL M. , Sotelo A., Madre M. A.

JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS, cilt.25, ss.4476-4482, 2014 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 25 Konu: 10
  • Basım Tarihi: 2014
  • Doi Numarası: 10.1007/s10854-014-2190-x
  • Dergi Adı: JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
  • Sayfa Sayıları: ss.4476-4482

Özet

In this work, the effect of K in the Bi2Sr2Ca1-xKxCu2O8+y superconductor with x = 0.0, 0.05, 0.075, and 0.1, has been investigated. The samples were prepared by a polymer solution technique using polyethyleneimine, PEI. The effects of K substitution have been investigated by electrical resistivity (rho-T), scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy, and magnetic characterizations. SEM and XRD results have shown that the Bi-(2212) phase is the major one independently of the K concentration. Moreover, the microstructure of samples is improved with K-concentration up to x = 0.075. From electrical resistivity measurements we have found that Tc is slightly higher than 91 K for K-concentrations up to 0.075, and then it decreases for higher doping for about 0.5 K. Moreover, this trend is maintained in the magnetic measurements in which the hysteresis loops are increased until 0.075 K-concentrations. The maximum calculated Jc, using Bean's model, has been found at around 4.5 10(6) A/cm(2) at 10 K and similar to 1,000 Oe for the 0.05 K doped samples.
In this work, the effect of K in the Bi2Sr2 Ca1-xKxCu2O8?y superconductor with x = 0.0, 0.05,
0.075, and 0.1, has been investigated. The samples were prepared by a polymer solution technique using polyethyleneimine, PEI. The effects of K substitution have been investigated by electrical resistivity (q-T), scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy, and magnetic characterizations. SEM and XRD results have shown that the Bi- (2212) phase is the major one independently of the K concentration. Moreover, the microstructure of samples is improved with K-concentration up to x = 0.075. From electrical resistivity measurements we have found that Tc is slightly higher than 91 K for K-concentrations up to 0.075, and then it decreases for higher doping for about 0.5 K. Moreover, this trend is maintained in the magnetic measurements in which the hysteresis loops are increased until 0.075 K-concentrations. The maximum calculated Jc,
using Bean’s model, has been found at around 4.5 106 A/cm2 at 10 K and *1,000 Oe for the 0.05 K doped samples