Abstract
A series of composites of the high temperature superconducting (HTSC) phase (Bi,Pb)2Sr2Ca2Cu3Ox (2223) with MgO were prepared. AC susceptibility measurements showed a percolation effect in the screening properties and critical current around 50 vol.% superconducting material, while maximum screening is reached at 70 vol.% of the HTSC phase. The shielding efficiency of superconducting material added to the composite is highest in the composition range between 40 and 70 volume percent HTSC phase. this behaviour can be understood in terms of random distribution of superconducting and non-superconducting phases and the occurrence of intergrain coupling effects.
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