Abstract
Intergranular critical current density ( J c int) has been measured for 15 MeV proton irradiated textured polycrystalline Bi 2Sr 2CaCu 2O 8+ x (Bi-2212) and Bi 1.84Pb 0.34Sr 1.91Ca 2.03Cu 3.06O 10+ x (Bi-2223) superconductors. The effects of irradiation on the grain boundary characteristics, in particular junction barrier thickness ( d) and junction width ( w), have been studied as a function of dose. At higher dose (i.e. >5×10 15 protons/cm 2), J c int is affected primarily by d rather than by w which is more prominent in Bi-2223 as compared to Bi-2212.
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