**.**

*Solid State Science and Technology, Vol. 17, No 1 (2009)
229-236 *

ISSN 0128-7389

**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 *

** **

**ABSTRACT **

The
measurements of ac susceptibility χχχ′′+′=*i*is
performed to determine the characteristics of intergranular components in
sintered Bi_{1.6}Pb_{0.4}Sr_{2}(Ca_{1-x}Ni_{x})_{2}Cu_{3}O_{δ},
(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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