The influence of a multistep intermediate pressing and sintering process on microstructure and the relation between microstructure and values of critical current density, Jc, in Bi, Pb-Sr-Ca-Cu-O high-Tc polycrystalline superconductors was studied. The Jc values increased with increasing number of pressing and sintering steps, n, only up to a certain value of n. The increase of Jc was reached by improvement of connections between grains due to compacting and by the alignment of superconducting grains in the c-axis direction. The maximal value of Jc was found for n = 5. The crack development is responsible for decreasing Jc for a higher number of steps.
Polymer Microstructure Material Processing Critical Current Density Crack Development
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