Effect of Nanosized NiF2 Addition on the Transport Critical Current Density of Ag-Sheathed (Bi1.6Pb0.4)Sr2Ca2Cu3O10 Superconductor Tapes. (28th January 2015)

• Record Type: Journal Article
• Authors: Hafiz, M.; Abd-Shukor, R.
• Other Names: Chinnappanadar Sanjeeviraja Academic Editor.
• Is Part Of: Advances in materials science and engineering. Volume 2015(2015)
• Publication Date: 2015-01-28
• Subjects: Materials science -- Periodicals; Materials science; Periodicals; 620.11
• DOI: 10.1155/2015/146476
• Languages: English
• ISSNs: 1687-8434

Abstract

Abstract : We report the effect of NiF2 (10 nm) additions on the transport critical current density, J c of (Bi1.6 Pb0.4 )Sr2 Ca2 Cu3 O10 /Ag sheathed superconductor tapes. Pellets of (Bi1.6 Pb0.4 )Sr2 Ca2 Cu3 O10 (NiF2 ) x (x = 0 –0.05 wt.%) superconductor were prepared using the acetate coprecipitation method. The sample with 0.04 wt.% addition of NiF2 exhibited the highest J c . Ag-sheathed (Bi1.6 Pb0.4 )Sr2 Ca2 Cu3 O10 (NiF2 )0.04 superconductor tapes were fabricated using the powder-in-tube (PIT) method and sintered at 845°C for 50 and 100 h. J c of nonadded tapes at 30 K sintered for 50 and 100 h was 6370 and 8280 A/cm 2, respectively. J c of (Bi1.6 Pb0.4 )Sr2 Ca2 Cu3 O10 (NiF2 )0.04 /Ag tape at 30 K sintered for 50 and 100 h was 14390 and 17270 A/cm 2, respectively. In magnetic fields (0 to 0.7 T), J c of the NiF2 added tapes was also higher compared with the nonadded tape indicating that NiF2 nanoparticles can act as effective flux pinning centers and longer sintering time improved the microstructure. A steeper increase in J c was observed below 60 K in the NiF2 added tapes which coincided with the Neel temperature, T N of nanosized NiF2 (60 K). The pronounced enhancement of J c was attributed to the strong interaction between flux line network and the antiferromagnetic NiF2 below T N .