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Results of x-ray powder diffraction analysis of the starting materials in Table 1a after annealing
| Composition No. | Annealing conditions | Phases present |
|---|---|---|
| 1A | 900 °C, Oxygen | 1223, 1212, (Sr,Ca)14Cu24O41 Plus other minor phases |
| 1B | 900 °C, Oxygen | 1223, 1212, (Sr,Ca)14Cu24O41, BaPbO3, CuO, CaO |
| 2 | 950 °C, Oxygen | 1223 (major), 1212 (minor), (Sr,Ca)14Cu24O41 |
