Phase Diagram and Crystal Growth of NdBa₂Cu₃O_7-y

Abstract

The phase diagram of a binary system between NdBa 2 Cu 3 O 7 and 3BaCuO 2 ·2CuO has been studied. A liquidus line which is favourable for obtaining NdBa 2 Cu 3 O 7 single crystals from solution is found to exist in a rather wide range compared with that of YBa 2 Cu 3 O 7 . Single crystals of NdBa 2 Cu 3 O 7- y have been grown by both the slow-cooling method and the top-seeded solution growth (TSSG) method, in accordance with the obtained phase diagrams of the NdBa 2 Cu 3 O 7 -3BaCuO 2 ·2CuO system and our earlier Y 2 O 3 -CuO-BaO system.