Effect of MgO and Ag2O Mix-Additions on the Formation and Superconducting Properties of Bi-2223 Phase

X.Y. Lu; D. Yi; H. Chen

doi:10.4028/www.scientific.net/AMR.1096.251

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 1096Effect of MgO and Ag2O Mix-Additions on the...

Effect of MgO and Ag₂O Mix-Additions on the Formation and Superconducting Properties of Bi-2223 Phase

Abstract:

The bulk samples with the composition Bi_1.8Pb_0.4Sr_1.9Ca_2.1Cu_3.5O_y + x wt% MgO + (5-x) wt% Ag₂O (x = 0, 1, 2, 3, 4 and 5) were prepared by sintering at 840°C for 240 h after partialmelting at 870°C for 1 h. The sample with individual Ag₂O addition shows the lowest melting temperature and the lowest proportion of the Bi-2223 phase, whereas the sample with individual MgO addition shows the highest melting temperature. The highest proportion of the Bi-2223 phase appears in the sample with 1wt% MgO and 4 wt%Ag₂O mix-additions. With increasing MgO content, the width of hysteresis loop ΔM of the bulk samples at 77 K increases (0≦x≦2), and then decreases (2≦x≦5). The largest ΔM appears in the sample with 2 wt% MgO and 3 wt% Ag₂O mix-additions.