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- W2024338738 abstract "Samples with the nominal composition Bi 1.8-x A x Pb 0.26 Sr 2 Ca 2 Cu 3 O y (x = 0-0.5; A = B, Al, Ga, In) were prepared. Measurements of resistivity, AC susceptibility, critical current density and magnetization have been used for characterization of the samples. All boron-substituted samples had a 2223 phase and narrow transition with the critical temperature T c 106-108 K and the critical current density J c (77 K) 10 5 A/m 2 . The presence of aluminium caused decrease of T c . The 2212 phase became evident and J c (77 K) sharply decreased at x≥0.3. The resistivity curves of all the samples with Ga were steeper. The T c values ranging from 103 to 60 K were considerably influenced by the amount of dopant. The volume of 2212 phase increased rapidly at x = 0.2 and J c decreased to zero below 77 K. Introducing indium into the samples had a rather positive effect on T c since the resistivity-temperature curves were always shifted towards higher temperatures with the narrow transition at ∼107 K although the XRD patterns showed that the samples also contained the 2212 phase. The samples with x = 0.05-0.4 had J c (77 K) 10 5 A/m 2 . The highest content of In worsened the quality of the samples and decreased the J c (77 K) to zero." @default.
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- W2024338738 date "2002-08-01" @default.
- W2024338738 modified "2023-10-17" @default.
- W2024338738 title "Superconducting properties of Bi-based ceramics with column 3A elements" @default.
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- W2024338738 doi "https://doi.org/10.1016/s0921-4526(02)00863-3" @default.
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