@article{oai:repo.lib.tut.ac.jp:00001557,
 author = {稲田, 亮史 and 奥村, 康裕 and 太田, 昭男 and 李, 成山 and 張, 平祥 and Inada, Ryoji and Okumura, Yasuhiro and Oota, Akio and Li, Chengshan and Zhang, Pingxiang},
 issue = {3},
 journal = {IEEE Transactions on Applied Superconductivity},
 month = {Jun},
 note = {This paper presents our recent progress for the
development of low-AC loss Bi2223 tapes with interfilamentary
oxide barriers. For the compatibility with Bi2223 phase formation
during sintering, SrZrO3 was selected as barrier materials.
Moreover, small amount of Bi2212 was mixed with SrZrO3 to
improve its ductility for cold working. Although some breakages
of barrier layers still existed, the effective transverse resistivity
was approximately 10 times higher than a tape with pure Ag
matrix. By controlling barrier thickness, reducing a tape width
below 3 mm and twisting the filaments with its length below 5 mm,
coupling frequency fc attained to 260 Hz in an AC perpendicular
transverse field. Critical current densities Jc of our twisted barrier
tapes were ranged in 12−15 kA/cm2 at 77 K and self-field, which
was 25−30 % lower than non-twisted one (= 18 kA/cm2). In our
knowledge, this is the first report to achieve both Jc > 12 kA/cm2
and fc > 250 Hz simultaneously in a single Bi2223 tapes. Our
barrier tapes showed 60-70% lower perpendicular field losses
than a conventional 4 mm-width tape with fully coupled filaments
at 50 mT and 50 Hz. These results are promising for remarkable
improvement in AC performance for Bi2223 tapes in future.},
 pages = {2779--2782},
 title = {Progress in Reducing AC Losses of Bi2223 Tapes with Interfilamentary Resistive Barriers},
 volume = {21},
 year = {2011}
}