The Effect of Powder-Impregnated Post-Rolling Sintering Process on SmFeAsO1-xFx Tapes Fabricated by Powder-in-Tube Method.

A series of SmFeAsO_1-xF_x (Sm1111) tapes were fabricated by the ex situ powder-in-tube (PIT) method. A powder-impregnated post-rolling sintering (PRS) process was applied to the Sm1111 tapes to suppress the loss of F element in the tapes during PRS. By this method, the Sm1111 tapes can endure long-time sintering at 850 ℃ without T_c degradation. A series of Sm1111 tapes with high transition temperature (> 50 K) were obtained. EPMA analysis reveals that the superconducting cores in tapes after this PRS process have the similar F concentration with the Sm1111 precursor bulk. [ABSTRACT FROM AUTHOR]