Research Article
Investigation of Structural Formation of Starting Composition 2245 in the Bi-Pb-Sr-Ca-Cu-O System Superconductors
Table 2
values and identified phases in the samples.
| | Sample | Sintering at 850°C
(hours) | Phases identified
from XRD | Colpitts oscillator | Four-probe | | onset (K) | (K) | onset (K) | zero (K) |
| | M12 A | 5 | 2212, 2223, Ca2PbO4 | | | | | | M12 B | 10 | 2212,2223, Ca2PbO4 | | | | | | M12 C | 15 | 2212, 2223, Ca2PbO4 | 110 | — | — | — | | M12 D | 20 | 2212, 2223, Ca2PbO4 | 120 | — | — | — | | M12 E | 25 | 2223, 2212, Ca2PbO4 | 124 | 107 | 125, 111 | 95 | | M12 F | 30 | 2223, 2212, Ca2PbO4 | 127 | 110 | 127, 115 | 105 | | M12 G | 40 | 2223, 2212, Ca2PbO4, Bi2O3 | 122 | 100 | 121 | 105 | |
P 2245 | 45 | 2223, 2212 | 119 | 100 | 120 | 100 |
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