Electromagnetic granularity, critical current density, and low-Tc phase formation at the grain boundaries in (Bi,Pb)2Sr2Ca2Cu3Oχ silver-sheathed tapes

Texture relationships and interface structure in Ag-sheathed Bi(Pb)-Sr-Ca-Cu-O superconducting tapes

“…We did observe a half-cell of 2212 at the Ag-2223 interface at a few Ag-BSCCO interfaces in two partially reacted samples in the very early stages of the 2212 to 2223 reaction. In these two samples, intergrowths of 2212 phase inside 2223 grains were very frequent, in contrast to fully processed 2223 tapes where 2212 phase intergrowths are extremely rare except at the (001) twist boundaries [20,21]. In fully processed 2223 tapes we have never observed 2212 at the Ag-BSCCO interface.…”

Microstructure, resistivity and critical currents of Ag-Bi/Pb(2223) tapes

“…[5], which nicely shows, that in tapes, prepared in a similar way like in this work, an intergrowth of Bi (2212) occurs in the Bi(2223) grains. According to ref.…”

“…According to ref. [5] these Bi(2212) layers tend to cluster at grain boundaries and their density is reduced in 'better' (i.e. more completely reacted) samples.…”

Improving the critical current density in Bi-2223 wires via a reduction of the secondary phase content

“…Note the high density of intergrowths in the Bi-2223 grain which is furthest away from the amorphous phase. In the case of earlier studies [8], [9], 2212 was observed at the basal plane boundaries of the 2223 grains and correlated with an 80 K kink in the vs curve of unrolled, as-produced samples. There was a highly nonlinear increase in as the 2212 intergrowth and the kink was eliminated.…”