caa a22 4500 445828366 CHVBK 20180317145306.0 cr unu---uuuuu 170323e20110801xx s 000 0 eng 10.1007/s10854-010-0274-9 doi (NATIONALLICENCE)springer-10.1007/s10854-010-0274-9 Fabrication and magnetoresistivit of ex-situ processed MgB2/Fe monofilament tapes without any intermediate annealing [Elektronische Daten] [E. Yucel, Cabir Terzioglu, A. Varilci, I. Belenli] We have fabricated MgB2/Fe monofilament wires and tapes by a powder-in tube (PIT) technique, using an ex-situ process without any intermediate annealing. MgB2/Fe monofilament tapes were annealed at 650-1,050°C for 60min and 950°C for 30-240min. We have investigated the effect of annealing temperatures and times on the formation of MgB2 phase, activation energy, temperature dependence of irreversibility field H irr(T) and upper critical field H c2(T), transition temperature (T c), lattice parameters (a and c), full width at half maximum, crystallinity, resistivity, residual resistivity ratio, active cross-sectional area fraction and critical current densities. We observed that the activation energies of the MgB2/Fe monofilament samples increased with increasing annealing temperature up to 950°C and with increasing annealing time up to 60min while it decreased with increasing magnetic field. For the MgB2/Fe monofilament tape, the slope of the H c2-T and H irr-T curves decreased with increasing annealing temperature from 850 to 950°C as well as with increasing annealing time from 30 to 60min. The transport and microstructure investigations show that T c, J c and microstructure properties are remarkably enhanced with increasing annealing temperature. The highest value of critical current density is obtained for the sample annealed at 950°C for 60min. The J c and T c offset values of the sample annealed at 950°C for 60min were found to be 260.43A/cm2 at 20 and 38.1K, respectively. Springer Science+Business Media, LLC, 2010 Yucel E. Department of Physics, Faculty of Arts and Sciences, Abant I zzet Baysal University, 14280, Bolu, Turkey aut Terzioglu Cabir Department of Physics, Faculty of Arts and Sciences, Abant I zzet Baysal University, 14280, Bolu, Turkey aut Varilci A. Department of Physics, Faculty of Arts and Sciences, Abant I zzet Baysal University, 14280, Bolu, Turkey aut Belenli I. Department of Physics, Faculty of Arts and Sciences, Abant I zzet Baysal University, 14280, Bolu, Turkey aut Journal of Materials Science: Materials in Electronics Springer US; http://www.springer-ny.com 22/8(2011-08-01), 1143-1153 0957-4522 22:8<1143 2011 22 10854 https://doi.org/10.1007/s10854-010-0274-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10854-010-0274-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yucel E. Department of Physics, Faculty of Arts and Sciences, Abant I zzet Baysal University, 14280, Bolu, Turkey aut NATIONALLICENCE 700 1- Terzioglu Cabir Department of Physics, Faculty of Arts and Sciences, Abant I zzet Baysal University, 14280, Bolu, Turkey aut NATIONALLICENCE 700 1- Varilci A. Department of Physics, Faculty of Arts and Sciences, Abant I zzet Baysal University, 14280, Bolu, Turkey aut NATIONALLICENCE 700 1- Belenli I. Department of Physics, Faculty of Arts and Sciences, Abant I zzet Baysal University, 14280, Bolu, Turkey aut NATIONALLICENCE 773 0- Journal of Materials Science: Materials in Electronics Springer US; http://www.springer-ny.com 22/8(2011-08-01), 1143-1153 0957-4522 22:8<1143 2011 22 10854 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer