MICROSTRUCTURE DEVELOPMENT IN ISOTHERMALLY MELT-TEXTURED 123-211 COMPOSITE-MATERIALS

Microstructures of isothermally melt-textured 123-211 composite materi als have been examined during the solidification process from quenched specimens. The distribution of 211 particles, the superconducting 123 grain boundary and the solid-liquid interface features are emphasized . The quality of the materials has been investigated by thermopower an d thermal conductivity measurements. A seeded-melt texturing technique has been also tested in order to grow large single-domain of DyBa2Cu3 O7-y. The chosen seed was a Dy2O3 single crystal.