2002/08/07 by Hongli Suo, H. L. Suo, P. Lezza +6 · 18 citations
Materials Science · Physics and Astronomy · #Composite material #Condensed matter physics #Critical current #Electrical engineering #Fabrication #Flux pinning #Grain boundary #Grain size #High-temperature superconductivity #Iron-based superconductors research #Materials science #Microstructure #Physics of Superconductivity and Magnetism #Recrystallization (geology) #Resistive touchscreen #Superconductivity #Superconductivity in MgB2 and Alloys #cond-mat.mtrl-sci #cond-mat.supr-con
paper · pdf · doi:10.1109/tasc.2003.812219
published in IEEE Transactions on Applied Superconductivity 13(2), 3265-3268 (IEEE Council on Superconductivity) · 4 pages, 8 figures; Submitted to ASC 2002
arxiv created 2002/08/07 · openalex publication_date 2003/06/01 · openalex created_date 2016/06/24 · arxiv updated 2018/07/04 · openalex updated_date 2026/08/05
Mono- and multifilamentary MgB/sub 2//Fe tapes and wires with high transport critical current densities have been prepared using the powder-in-tube (PIT) process. The fabrication details are described. The effect of powder grain sizes and recrystallization temperature on j/sub c/ has been investigated. At 25 K and 1 T, j/sub c/ values close to 10/sup 5/ A/cm/sup 2/ were measured, while j/sub c/ of 10/sup 6/ A/cm/sup 2/ were extrapolated for 4.2 K/0T in our monofilamentary tape. MgB/sub 2//Fe tapes exhibit high exponential n factors for the resistive transition: n/spl ap/80 and 40 were found at 5 T and 7 T, respectively. The highest transport j/sub c/ values obtained so far in MgB/sub 2//Fe wires with 7 filaments were 1.1/spl times/10/sup 5/ A/cm/sup 2/ at 4.2 K and in a field of E2 T, which is still lower than for monofilamentary tapes. The function F/sub p//spl prop/b/sup p//spl middot/(1-b)/sup q/ has been established over the whole field range, and exhibits a maximum at F/sub p//spl cong/0.18. Improved deformation and recovering processing is expected to lead to higher j/sub c/ values.