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High pressure-high temperature (HP-HT) treatment of melt-textured YBa2Cu3O7 − δ at 2 GPa, and in the 800–950 °C pressure-temperature range for 15–30 min in contact with monoclinic pre-annealed zirconia induces: (1) the increase of the material density from 5.7 to 6.3 g/cm3 (by 9%), (2) the increase of critical current density in the direction of c-axis of YBa2Cu3O7 − δ grains from 3–3.5 × 103 up to...
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