The microstructure, preferred orientation, and axial inhomogeneities of composition and critical currents in melt-textured YBCO samples in the shape of bars were studied. The microstructure of the material is dominated by large platelike grains. Most of these grains consist of YBa2Cu3Ox (123 phase); large grains of Y2BaCuO5 (211 phase) and a 123/211 intergrowth phase are also present. In addition, the material contains small, randomly oriented grains of Y2BaCuO5, YBa2Cu3Ox, and BaCuO2. A wide scatter in 211 content and oxygen stoichiometry of 123 along the bar samples is revealed. The variations in phase composition are found to be strongly correlated with those in critical current.
|Number of pages||6|
|Publication status||Published - 1 Dec 1998|