We developed a batch production of large grain c-axis oriented GdBa 2Cu3Oy and SmBa2Cu3O y bulk superconductors by using a cold seeding method in air. Novel thin film Nd-123 seeds grown on MgO crystals were used as a seed crystal for the batch process. Four pieces of single domain Gd-123 samples with 50 mm in diameter were successfully fabricated in single run. Magnetization results confirmed that the samples have a sharp superconducting transition with the onset Tc around 93 K. On the other hand Sm-123 system was studied as a function of varying amounts of BaO2 to reduce the Sm/Ba solid state substation and batch production in air. The magnetization results indicated that superconducting transition was increased with increasing the BaO 2 concentration from 91.5 K for 0 wt% to 93 K for 0.2 and 0.3 wt%. Moreover, the maximum trapped field of 2.1 T and 1.5 T at 20 K was recorded 16 mm in diameter Sm-123 with 3 and 1 wt% BaO2 addition.
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