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CHARACTERISATION OF MERCURY-SUBSTITUTED (Bi,Pb)&Ca2Cu30x (2223) HIGH-T, PHASE USING SYNCHROTRON RADIATION AND NEUTRON DIFFRACTION DATA

Hg-substituted (Bi,Pb)-(2223) high-T, superconductor material, synthesised by a process involving solid state reaction of nitrate starting materials, has been characterised using synchrotron radiation diffi-action (SRD) and neutron diffraction (ND) data. The absence of SRD pattern lines from prospective contaminant phases, notably from low-T, (2212), indicated that the material could be described as single-phase. The SRD data provided indexing results for satellite reflections which are clearly superior to those for Bragg-Brentano laboratory XRD data. Indexing gave a one-dimensional modulated structure, described by a two-component wave vector, which is very similar to that reported earlier for the unsubstituted (Bi,Pb)-(2223) phase. A structure for (Bi,Pb)-(2223) with Hg substitution has been proposed based on models reported in the literature and ND Rietveld refinement calculations with a commensurate structure model. The study has highlighted the value of using SRD data, rather than Bragg-Brentano laboratory-source x-ray data, to test for single-phase character in high-T, research.