A D Damodaran
Articles written in Bulletin of Materials Science
Volume 16 Issue 6 December 1993 pp 403-403
Volume 17 Issue 6 November 1994 pp 577-584
YBa2SnO5·5, a novel ceramic substrate for YBCO and BiSCCO superconductors
J Koshy K S Kumar J Kurian Y P Yadava A D Damodaran
YBa2SnO5·5 has been synthesized and sintered as single phase material for its use as substrate for both YBCO and BiSCCO superconductors. YBa2SnO5·5 has a complex cubic perovskite (A2BB’O6) structure with the lattice constant
Volume 18 Issue 5 September 1995 pp 517-529
U Syamaprasad M S Sarma A R Sheeja Nair P Guruswamy P S Mukherjee J Koshy A D Damodaran
Silver clad Bi-2223 tapes with consistently high critical current densities of over 30,000 A/cm2 at 77 K and zero field were prepared by powder-in-tube (PIT) technique. Powder XRD, electron microscopy, a.c. susceptibility and critical current measurements were used to study the phase assemblage, microstructure and transport properties of these tapes at various stages of processing. The precursor powder for PIT process was prepared by a sol-gel route by acrylate method using freshly prepared nitrates of Bi, Pb, Sr, Ca and Cu. The carbon content in the powder was minimized by subjecting it under dynamic vacuum calcination followed by heating in free flow of oxygen for long durations with intermittent grindings. The choice of initial stoichiometry, high reactivity of the precursor, effective removal of carbon, choice of phase assemblage at the filling stage and the multistage thermomechanical processing at optimized conditions were found to be responsible for the high critical current density.
Volume 43, 2020
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Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020
Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020
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