Abstract
We have analyzed experimental data on the effect of short-term melting followed by recrystallization on the microstructure and critical current density of YBa2Cu3O7 − x , Bi2Sr2CaCu2O8 − x , and Bi2Sr2Ca2Cu3O10 − x high-T c ceramics. The ceramics were melted using different heat sources: infrared lamps, laser radiation, and electric current. A significant increase in the critical current density of Bi2Sr2Ca2Cu3O10 − x ceramics (by a factor of 40 at 20 K and by a factor of 8 at 77 K) was achieved using cw CO2 laser irradiation. Melting TiC-doped (0.1%) Bi2Sr2Ca2Cu3O10 − x ceramics with a CO2 laser, followed by annealing, insured an even larger increase in critical current density: by a factor of 35 at 77 K. We have calculated the thickness of the molten layer produced by laser heating of high-T c ceramics.
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