Solid State Science and Technology, Vol. 17, No 1 (2009) 229-236
GRAIN – MATRIX MOSAIC CONTRIBUTION TO ac LOSSES IN Ni – DOPED BSCCO CYLINDERS
M.I. Adam, S.A. Halim, M.A.M. Faisal, H. Baqiah and M. Kamarulzaman
Superconductor and Thin film Laboratory, Department of Physics, Faculty of Science, 43400
UPM, Serdang, Selangor, D E. MALAYSIA
The measurements of ac susceptibility χχχ′′+′=iis performed to determine the characteristics of intergranular components in sintered Bi1.6Pb0.4Sr2(Ca1-xNix)2Cu3Oδ, (x = 0.0 – 0.05) polycrystalline cylinders prepared by the conventional route. Theoretical values of for idealized cylinder were calculated in the range"maxχ10≤≤k, correspondence of the Bean and the simplified Kim critical state models. Magnetization curve for various stages in the specimens is hence approximated. It is found that Ni content in BSCCO system changes the effective volume fraction of the grains, field dependence of the intergranular critical current density, transition temperature, and the intergranular pinning property.
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