MAGNETIC PROPERTIES OF YBa_2 Cu_3 O_7-δ MELT TEXTURED SAMPLES PREPARED BY POWDER MELTING PROCESS AND QUENCH AND MELT GROWTH TECHNIQUES

摘要

The microstructure and magnetic properties of the melt textured YBa_2 Cu_3 O_7-δ samples prepared by the powder melting process, in which Y_2 Cu_2 O_5 and BaCuO_2 were used as precursors, and those prepared by the Quench and melt growth method are described and compared. The lattice pa- Rameters and T_c values for the samples prepared by the both techniques were Similar. The penetration and the spatial distribution of the magnetic flux in The superconducting samples was imaged by means of a field-mapping device Using a Hall probe.