Abstract
In the present work on the basis of experimental phase relations in the copper-rich corner of the Nd–Ba–Cu–O system, insulating crystals of the Nd 1+ x Ba 2− x Cu 3O z solid solution (Nd123ss) with x=0.43, 0.8, 0.85 were grown by the top-seeded solution growth method. The as-grown crystals with x=0.8–0.85 were found to be orthorhombic at room and elevated temperatures. It was confirmed that the orthorhombicity is not related to the tetragonal-to-orthorhombic phase transition but is caused by the heterovalent substitution of barium with neodymium. As a result, a twin-like structure was observed and the twin-plane re-entrant edge growth mechanism was proposed for the first time in this system.
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