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Effect of Lithium Doping in the Bi‐2212 Superconducting System
Author(s) -
Gopalakrishna B.,
Chandra Sekhar M.,
Suryanarayana S. V.
Publication year - 1995
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.2170300324
Subject(s) - doping , electrical resistivity and conductivity , lithium (medication) , analytical chemistry (journal) , liquid nitrogen , melting point , superconductivity , diffraction , materials science , chemical composition , chemistry , crystallography , condensed matter physics , physics , quantum mechanics , medicine , optoelectronics , organic chemistry , chromatography , optics , composite material , endocrinology
Samples with the nominal composition Bi 2 Sr 2 Ca 1– x Li x Cu 2 O y ( x = 0.2,0.4, and 0.6) and Bi 2 Sr 2 CaCu 2− x L1 x O z ( x = 0.4, 0.6, and 1.0) were prepared by the solid state reaction method. The role of L1 at both Ca and Cu sites in the Bi‐2212 composition were studied. From the X‐ray diffraction data it was found that the L1‐doped at the Ca site increases the c ‐axis and that doped at the Cu site decreases the c ‐axis. From the D.C. four‐probe resistivity data it was found that Li‐doped at the Ca site reduces the T c and the L1‐doped at the Cu site gives T c (0) above the liquid nitrogen temperature. It was observed that the L1 doping reduces the melting point of Bi‐2212 composition. The presence of Lithium was confirmed by inductive the coupled plasma method.