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Improvements in the Current Carrying Capacity in High-Tc BiSrCaCuO Superconductors

Remarkable improvements in the critical current density of the BiSrCaCuO sintered specimens have been achieved by a modified combination of heat treatment and pressing. The disk-shaped specimens were pressed uniaxially at room temperature after an initial sintering treatment and heated again at the same sintering temperature. This intermediate pressing method has produced a strongly oriented microstructure with a remarkably large critical current density. Correlation between microstructure and the critical current density, Jc, as well as anisotropy of the Jc with respect to the magnetic field direction has been described.