CRISMAT Laboratory (UMR 6508 CNRS/ISMRA), 6 boulevard du Maréchal Juin, 14050 Caen, France
Most of NdBaCuO synthesis were realized under oxygen controlled melt growth (OCMG) which allows to avoid the solid solution formation. However, for industrial applications air synthesis is preferable due to its simplicity and its cost. In this work, different seeds and thermal cycles have been investigated in order to optimize the nucleation conditions for the obtention of a single domain. Several criteria have been defined for the choice of the seed. The solid solution Nd1+x Ba2−x Cu3O y formed in these air synthesised samples appears in the range of x = 0.10 to 0.15, corresponding to between 60 K and 80 K. The nominal composition and the synthesis conditions (substrate, thermal treatments.) have to be accurately defined in order to avoid neodymium-rich solid solution formation.
(Received July 31 2000)
(Revised October 30 2000)
(Accepted November 14 2000)
(Online publication March 15 2001)
* This paper has been presented in “Sixièmes journées de cryogénie et supraconductivité” at Aussois on May 16-19, 2000.