Phase Diagrams in High Temperature Superconductors

摘要

Phase diagrams serve as "road maps for processing high T superconductors. Of current interest are the Ba_2RCu_3O_(6+x) (R = Sm, Gd and Er) superconductors. The critical single-phase regions of Ba_(2+x)(Nd_(1+x-y)R_yCu_3O_(6+x) for R = Gd, Y and Yb were determined such that both flux-pinning and melting can be tailored and optimized. The construction of subsolidus phase diagrams of these systems, and the role of phase equilibria and kinetics in the formation of the Ba_2YCu_3O_(6+ x)phase, are deemed important for the rapid advancement of second generation coated conductor technology