Improvement of Jc of Ag-Sheathed Bi-2212 Tapes Using Melt-Growth Technique under Reduced Oxygen Partial Pressure
- 1 October 1993
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 32 (10B) , L1509
- https://doi.org/10.1143/jjap.32.l1509
Abstract
The growth behavior of Bi-2212 under the oxygen partial pressure of 0.01 atm has been investigated using Ag-sheathed tapes. In the partial melt state, a Cu-free phase and (Sr, Ca)CuO2 have been observed as solid phases. The Cu-free phase has been assigned, tentatively, as Bi2Sr2CaO6. The grain size of the Cu-free phase has been found to depend critically on the starting composition. It decreases as the Sr content increases and the Ca content decreases, and accordingly, J c of the melt-processed tapes increases. The optimum composition is Bi2Sr2.3Ca0.85Cu2O z and the maximum J c is 1.5×105 A/cm2 at 4 K.Keywords
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