Abstract
A quench and directional phase transformation process has been developed to achieve grain alignment in bulk YBa2Cu3Ox superconductors at temperatures about 100 °C below the peritectic temperature. Isothermal phase transformation of quenched precursors at 890 °C for 3 min is found to result in the formation of more than 75% of YBa2Cu3Ox phase without any formation of Y2BaCuO5. Phase transformation at higher temperatures leads to rapid formation of Y2BaCuO5 in addition to YBa2Cu3Ox. A well-aligned microstructure is achieved by directional phase transformation of the quenched compacts as a rate of 10 mm/h. The magnetic field dependence of the critical current density at 77 K of the directionally phase transformed material compares well with that of melt-textured YBCO and is superior to that of magnetically aligned and sintered YBCO.
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