Browsing by Author "Dissanyake, M.A.K.L. and others"

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    Effect of As substitution on superconducting properties of the (Bi,Pb)-Sr-Ca-Cu-O System
    (University of Peradeniya. Peradeniya, 1995) Dissanyake, M.A.K.L. and others
    Superconducting properties of three systems with nominal stoichiometry (Bi0.7Pb0.3)SrCaCu1.5Oy (Sample A), (Bi0.5As0.2Pb0.3)SrCaCu1.5Oy(Sample B) and (Bi0.7As0.2Pb0.1)SrCaCu1.5Oy (Sample C) have been investigated using electrical resistivity, ac magnetic susceptibility and X-ray power diffraction measurements. Results show that, As is incorporated into the structure in sample B, still retaining superconducting properties but with a lower Tc of 80K. Sampel C where As is expected to replace Pb, however, does not show superconductivity and exhibit multiphase behaviour with several impuirty phases.