过冷度对新TSIG法单畴SmBCO超导块材生长规律及其性能的影响

he physical properties of SmBCO bulks will be greatly reduced when it is prepared in air by traditional melt growth process(MTG), because of the serious substitution of Sm3+ on Ba2+ site. In order to reduce the solid solubility x in the (Sm1+xBa2-xCu3Oy) crystals, we provide a new method to fabricated single-domain SmBCO superconductors by TSIG process with (Sm2O3+1.2BaCuO2) as new solid phase; the effects of the supercooling degree on the crystal growth dynamics, microstructures and properties of the SmBCO bulks have been investigated. The results show that the growth rate of the SmBCO crystal increases gradually with the increase of the supercolling degree at first, but decreases when the supercooling degree is too high; the higher the supercooling degree, the smaller the average size of Sm211 particles captured in the SmBCO bulks; the higher the supercooling degree, the lower the onset superconducting transition temperature, the widder the transition temperature width, and the higher the critical current density. These results indicate that the physical properties of SmBCO bulks can be greatly improved by this new method because of the greatly reduced Sm3+/Ba2+ substitution during the TSIG process, which provide an important new way for the fabrication of high-quality SmBCO superconductors.