Critical current density - composition diagram

• Ba-Cu-Fe-O-Y
• Ba-Cu-Fe-Nd-O
• Bi-Ca-Cu-O-Pb-Sm-Sr
• Bi-Ca-Cu-Gd-O-Pb-Sr
• Ge-Nb
• transitional
• alkaline
• conductor
• chalcogen
• rare earth
• orthorhombic
• tetragonal
• hexagonal
• cubic
• trigonal