Solid State Science and Technology, Vol. 17, No 2 (2010) 45-51
EFFECT OF INTERMEDIATE ROLLING ON THE TRANSPORT PROPERTIES OF (Bi1.6Pb0.4)Sr2Ca2Cu3O10 SUPERCONDUCTOR
TAPES WITH NANO NiFe2O4 ADDITION
W. Kong and R. Abd-Shukor
School of Applied Physics, Faculty of Science and Technology,
Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
The effects of nano sized NiFe2O4 addition in (Bi1.6Pb0.4)Sr2Ca2Cu3O10 (Bi2223) superconductor tapes were investigated. The (Bi1.6Pb0.4)Sr2Ca2Cu3O10 powders were prepared by using coprecipitation technique and the tapes were prepared by using the powder-in-tube method (PIT). 0.01 wt% nano sized NiFe2O4 (13 nm) was added to the powders as this ratio of nano NiFe2O4 optimized the critical current density (Jc) of bulk samples based on our initial studies. The effects of intermediate rolling on the transport critical current density of the (Bi1.6Pb0.4)Sr2Ca2Cu3O10-(NiFe2O4)0.01 tapes were investigated. The transport critical current density at 30 K was 17870 A/cm2 for tapes sintered for 50 hours without intermediate rolling. Intermediate rolling up to two times increased the Jc at 30 K to 32700 A/cm2. Intermediate rolling improved the Jc of the tapes by 83 % compared to tapes without intermediate rolling.
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