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Influence of the Ca:Pb ratio on the superconducting properties of Bi‐based ceramics of type 2223
Author(s) -
Rentschler T.,
Schulz C.,
Zoller P.,
Lösch S.,
Raff E.,
Wischert W.,
KemmlerSack S.,
Kessler P.,
Lichte H.,
Nissel T.,
Huebener R. P.
Publication year - 1994
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.19945060202
Subject(s) - superconductivity , ceramic , atmosphere (unit) , materials science , analytical chemistry (journal) , superconducting transition temperature , condensed matter physics , physics , thermodynamics , metallurgy , chemistry , environmental chemistry
From a study of the influence of the Ca: Pb ratio on the superconducting properties of Bibased ceramics of 2223 type it follows that as a second parameter the employed gas atmosphere must be taken into consideration. In case of air preparation good intragrain and intergrain properties are obtained for Ca rich samples (e.g. Bi 1.8 Pb 0.2 Sr 1.9 Ca 2.1 Cu 3 O z ); whereas for Pb rich materials (e.g. Bi 1.7 Pb 0.5 Sr 1.9 Ca 1.9 Cu 3 O z ) improved conditions are encountered by employment of an Ar/O 2 (8%) atmosphere during synthesis. Independently, the transition temperature is situated near 108 K.