Abstract
We present systematic studies of electromagnetic and microstructural properties of bulk Bi 2Sr 2CaCu 2O 8+δ (Bi2212) bicrystals having synthetic [001] twist or naturally-grown [100] tilt boundaries. We find that [001] twist boundaries in as-prepared bicrystals, regardless of twist angles, conduct virtually the same critical current I c as the constituent single crystals. We also irradiated some of the [001] twist bicrystals with 2.2 GeV Au-ions, and found that the [001] twist grain boundaries carry significantly less critical current than the irradiated single crystals in magnetic field. For naturally grown [100] tilt boundaries, we find a general T c depression by several degrees at the grain boundary. Strong coupling behavior was observed in several high angle tilt grain boundaries below the grain boundary T c Gb.
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