Ac losses in Ni-doped Bi1.6Pb0.4Sr2(Ca1-xNix)(2)Cu3O delta ceramic superconductors


ÇELEBİ S., Malik A., Inanir F. , Halim S.

SUPERCONDUCTOR SCIENCE & TECHNOLOGY, cilt.17, ss.1121-1125, 2004 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 17 Konu: 10
  • Basım Tarihi: 2004
  • Doi Numarası: 10.1088/0953-2048/17/10/005
  • Dergi Adı: SUPERCONDUCTOR SCIENCE & TECHNOLOGY
  • Sayfa Sayıları: ss.1121-1125

Özet

The complex ac susceptibility chi = chi' + chi" was measured as a function of temperature and ac field amplitude on rectangular bar shaped high-temperature superconductors with nominal composition of Bi1.6Pb0.4Sr2(Ca1-xNix)(2)Cu3Odelta (x = 0-0.10) superconducting samples prepared by the solid state reaction method. It is found that as the amount of Ni doping increases, the critical temperature T-c slowly decreases. A small amount of Ni doping (x = 0.03) increases the intergranular critical current j(cm) and the flux pinning of the Bi(Pb)-2223 system. The effective volume fraction of the grains and the field dependence of the intergranular critical current density were estimated by comparison of the maximum of the extracted matrix susceptibility and the corresponding calculated data which was obtained from hysteresis losses employing the power law critical state model.