Grain-aligned YBa2Cu3O7−x films were fabricated by vacuum filtration in an applied magnetic field (7 T). Platinum (Pt) was shown to lower the peritectic temperature of YBa2Cu3O7−x by almost 75 °C, leading to dramatic microstructural differences between films densified on MgO (single crystal) substrates and those densified on Pt foil to a maximum temperature of 1020 °C in oxygen. Superconducting quantum-interference device hysteresis loops measured at 0–5.5 T at 5 K showed that films fired on Pt had ΔM (Happ∥c axis) values 15–60 times larger than those fired on MgO.
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Lewis et al. (1994) studied this question.
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