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Growth Kinetics of High‐ T c and Low‐ T c Phases in Bi 2‐x Pb x Ca 2 Sr 2 Cu 3 O y Superconducting Compounds
Author(s) -
Rao D. Mangapathi,
Somaiah T.,
Haribabu V.,
Venudhar Y. C.
Publication year - 1993
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170280302
Subject(s) - bismuth , superconductivity , impurity , kinetics , analytical chemistry (journal) , materials science , decomposition , magnetic susceptibility , phase (matter) , doping , thermal decomposition , critical current , metal , chemistry , mineralogy , nuclear chemistry , crystallography , metallurgy , chromatography , condensed matter physics , physics , quantum mechanics , optoelectronics , organic chemistry
Abstract Superconducting samples of the composition Bi 2‐x Pb x Ca 2 Sr 2 Cu 3 O y (x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) are prepared by co‐decomposition of metal nitrates. DTA, TGA, density, and porosity studies have been performed on these samples. Characterisation techniques like XRD, SEM, EDXA, d.c. resistance, and a.c. magnetic susceptibility have been employed to study the growth of High‐ T c (HTP) and Low‐ T c (LTP) phases upon lead substitution for bismuth. Results have revealed the growth of HTP with increase in Pb conc. up to x = 0.3. Further increase in Pb appears to results in the deterioration of HTP resulting in the formation of LTP and Ca 2 PbO 4 impurity phase. Transport critical current density ( J c ) measurements performed on the samples indicate that Pb doping followed by densification remarkably improves the current carrying capacity of the materials.