• S Venkat Reddy

      Articles written in Bulletin of Materials Science

    • X-ray line profile analysis of silver base Ag-Cd-In alloys

      S Venkat Reddy S V Suryanarayana

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      X-ray diffraction line profiles of five silver base ternary alloys in α-phase with varying atomic percentages of cadmium and indium were recorded in both cold-worked and annealed states of the samples. Detailed studies on the profiles involving peak shift, peak asymmetry and Fourier analysis of line shapes have been carried out to evaluate microstructural parameters such as deformation fault probabilities,rms strains and dislocation densities. It was found that the addition of indium has a marked effect in producing deformation fault probabilities in comparison to that of adding cadmium in ternary silver base alloys. Compound fault probability was found to be maximum for the alloy Ag-10Cd-15In.

    • Superconductivity in Na-doped Bi2Sr2CaCu2Oy system

      S V Suryanarayana B Gopala Krishna Ravichandra Gundakaram S Venkat Reddy

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      Samples with the nominal composition Bi2Sr2Ca1−xNaxCu2Oy (x=0, 0·1, 0·2 and 0·3) were prepared by solid-state reaction of the individual compounds. X-ray diffraction patterns indicate that the samples have a majority 2212 phase with 2223 also being present. From the DC four-probe resistance data, we have observed that the furnace-cooled samples show metallic behaviour while the quenched samples show superconductivity up to 97 K.

    • Effect of annealing and quenching on superconductivity in Pb and Sb-doped Bi2Sr2Ca2Cu3Ox

      S V Suryanarayana Ravichandra Gundakaram B Gopala Krishna S Venkat Reddy

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      Samples of the series Bi1·9−xPbxSb0·1Sr2Ca2Cu3Oy withx=0, 0·1, 0·2, 0·3 and 0·4 were prepared by the solid-state route. The X-ray and d.c. electrical resistivity data on furnace-cooled and quenched samples are presented. Though the starting composition is 2223, the end products were multiphase with 4334 as the major phase. A superconducting transition withTc=100K was observed in the pure 2223 sample after quenching. The furnace-cooled samples were metallic, while samples withx=0·1, 0·2 and 0·3 were superconducting after quenching. The amount of the 4334 phase decreases with increasing Pb content. Quenching seems to be favourable for the formation of the 4334 phase.

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