Ba-Cu-O-Y, Electrical conductivity, Y-x polyhedra

• Ba-Cu-La-O-Y
• Al-Ba-Cu-O-Y
• Ba-C-Cu-O-Y
• Ba-Co-Cu-Fe-O-Y
• transitional
• chalcogen
• alkaline
• rare earth
• oxide
• orthorhombic
• tetragonal
• cubic
• monoclinic
• trigonal