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Flux Loss and Neutron Diffraction Measurement Ag-sheathed Bi-2223 Tapes in terms of Flux Creep  

Jang Mi-Hye (MSEL, United States Department of Commerce NIST)
Publication Information
KIEE International Transactions on Electrophysics and Applications / v.5C, no.5, 2005 , pp. 204-210 More about this Journal
Abstract
Alternating current (AC) losses of two Bi-2223 ([Bi, Pb]: Sr: Ca: Cu: O = 2:2:2:3) tapes [(Tape I, un-twist-pitch) and the other with a twist-pitch of 10 mm (Tape II)] were measured and compared. These samples, produced by the powder-in-(Ag) tube (PIT) method, are multi-filamentary. Also, it's produced by non-twist and different twist pitch (8, 10, 13, 30, 50 and 70 mm). The critical current measurement was carried out under the environment in liquid Nitrogen and in zero-field by 4-probe method. Susceptibility measurements were conducted while cooling in a magnetic field. Flux loss measurements were conducted as a function of ramping rate, frequency and field direction. The AC flux loss increases as the twist-pitch of the tapes decreased, in agreement with the Norris Equation. Neutron-diffraction measurements have been carried out investigate the crystal structure, magnetic structures, and magnetic phase transitions in Bi-2223([Bi, Pb]:Sr:Ca:Cu:O)
Keywords
Neutron-diffraction; flux flow; flux creep; eddy current loss; AC loss; magnetization;
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