High-temperature resistivity (R4) measurements of Bi 1 Sr 1 Ca 1 Cu 2 O y (BSCCO) revealed that R4 increases almost linearly with temperature up to about 800°C and sharply increases above 870°C. The interface resistivity between BSCCO sample and electrodes (Pt) revealed anomalous increments at around 650°C and 800°C, a possible indication of some kind of crystal instability in BSCCO. Impurity ( Mg, Pb or Sb ) substitution effects were also studied. The superconducting properties of BSCCO are sensitively affected by Pb and Sb substitutions, but less sensitively by Mg substitution.
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