EFFECT OF HEAT TREATMENT ON THE PROPERTIES OF HIGH-TC BIBASED SUPERCONDUCTORS

Increase in critical temperature of superconductors is a major area of research. we have used ceramic technique in order to synthesize high tc conductors. we have also studied the temperature dependence of the electrical resistivity of high-tc bismuth based superconductors. these superconductors have been prepared from the materials bismuth oxide (bi_2o_3), lead oxide (pbo), strontium carbonate (srco_3), calcium carbonate (caco_3), barium oxide (bao) and copper oxide (cuo) with conventional solid state reaction using general formula bi_2sr_2ca_n-1cuno_2n+4+δ. the structural properties of the samples were investigated through x-ray diffraction analysis performed at room temperature. electrical resistivity has been measured using four probe method. the critical temperature of the bi-based superconductors has been found to be 100 k.