• S H Pawar

      Articles written in Bulletin of Materials Science

    • Electrochemical processing of high-Tc Bi(Pb)-Sr-Ca-CuO thin films

      N V Desai L A Ekal D D Shivagan S H Pawar

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      Superconducting thin films of Bi(Pb)-Sr-Ca-CuO system were prepared by depositing the film onto silver substrate by d.c. electrodeposition technique with dimethyl sulphoxide bath in order to examine the effect of Pb addition to the BSCCO system. The films were deposited at the potential of -0.8 V vs saturated calomel electrode (SCE) onto the silver substrate. The different preparative parameters such as deposition potential, deposition time were studied and optimized. These films were then oxidized electro-chemically at room temperature in an alkaline (1 N KOH) solution, and also at 600°C temperature in an oxygen atmosphere. The films showed the superconducting behaviour, with Tc values ranging between 85 K and 96 K, respectively.

    • Effect of sintering temperature on structural and electrical properties of gadolinium doped ceria (Ce0.9Gd0.1O1.95)

      L D Jadhav S H Pawar M G Chourashiya

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      Gadolinium doped ceria oxide is one of the promising materials as an electrolyte for IT–SOFCs. Ce0.9Gd0.1O1.95 (GDC10) powder was prepared by solid state reaction and sintered at 1473 K, 1573 K, 1673 K and 1773 K. All samples were studied using X-ray diffraction, scanning electron micrograph and d.c. conductivity measurement. The crystallinity and surface morphology of the samples improved with sintering temperature. Further, the electrical conductivity measurement indicated that the conduction mechanism is mainly ionic. The conductivity of samples sintered at 1673 K and 1773 K at 800°C are of the order of 0.1 S-cm-1. The activation energies decreased from 1.25–0.82 eV with increase in sintering temperature.

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