CRYSTAL MORPHOLOGY AND 3-DIMENSIONAL-LIKE GROWTH-MODEL OF DYBA2CU3O7-D SUPERCONDUCTING MATERIALS SYNTHESIZED IN-SITU IN 0.6-T

This report discusses the crystal growth mechanism of 123 superconducting ceramics from scanning electron micrographs made on DyBa2Cu 3O7-d superconducting materials synthesized by peritectic recombination under a magnetic field. Such a synthesis procedure is used only here in order to enhance the growth features of textured materials. The micrographs reveal that the crystal growth model must be strictly tridimensional. The proposed model, followed by computer simulations, can then explain all the microstructure data reported for such textured materials. The preferred growth direction in the a-b planes could also be expected to be the 〈100〉 direction. © 1994 American Institute of Physics.