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Resistance and Current Density Studies on Plasma Sprayed Coatings of Bi(Pb)CaSrCuO Superconducting Materials
Author(s) -
Rao D. Mangapathi,
Mishra D.,
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.2170280218
Subject(s) - superconductivity , materials science , sintering , substrate (aquarium) , coating , analytical chemistry (journal) , metallurgy , plasma , brittleness , current density , critical current , nuclear chemistry , composite material , chemistry , condensed matter physics , oceanography , physics , chromatography , quantum mechanics , geology
Plasma spraying is a potential technique for forming flexible tapes from brittle high T c oxides. It is possible to obtain superconducting Bi(Pb)CaSrCuO coating by suitable heat treatment schedule after spraying. In an effort to get maximum transport current densities ( J c ) of the coating, the content of lead and sintering time have been optimised. A J c value of 200 Amp/cm 2 is obtained in Bi 1.4 Pb 0.6 · Ca 2 Sr 1.9 Cu 3 O y specimen coated on silver sprayed Fe[(Ag)/Fe] substrate. Remarkable improvement in J c values up to 694 Amp/cm 2 is obtained in the same specimen coated on Ca 2 Sr 1.9 Cu 3 O y sprayed Fe[Ca 2 Sr 1.9 Cu 3 O y )/Fe] substrate. The observed decrease in J c (B) curves with increase in magnetic field shows the presence of weak coupling between the grains.