THE INFLUENCE OF SRSO4 ADDITIVES TO BI2SR2CACU2O8 HIGH-TEMPERATURE SUPERCONDUCTORS

For application in electrical engineering BSCCO 2212 high temperature superconductors have been manufactured with an admixture of strontium sulphate (SrSO4). On three samples with different SrSO4 content we hav e measured the specific heat and the thermal expansion behaviour in th e temperature region between 4.2 K and 293 K. The admixture increases the specific heat and the contraction, which indicates a decreasing De bye temperature. At both properties anomalies indicate the phase trans ition point at about 90 K. The temperature dependence of the thermal p roperties below 20 K is characteristic for amorphous behaviour of soli ds.