Abstract
BiPbSrCaCuO samples were produced by the spray-frozen, vacuum-freeze drying method from nitrate solutions. Structural modifications of crystallites during sintering were investigated in agreement with bulk density, phase structure of the samples, critical temperature T c and critical current density j c. A model for morphology changes of (2223) crystallites during sintering was proposed. Maximum j c in a zero magnetic field is reached on samples sintered for 200–250 h.
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