CRYSTAL DEFECTS IN TlBaCaCuO SUPERCONDUCTOR

Crystal defects, such as grain boundary, dislocation, stacking disorder, phase boundary and surface of granule were examined by high resolution electron microscope (HREM) in superconducting T1₂Ba₂Ca₂Cu₃O_x. Some possible effects of the defects on the sample's properties viz., Jc and Tc are discussed.