English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

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.

Transport critical current densities and n factors in mono- and multifilamentary MgB/sub 2//Fe tapes and wires using fine powders