Ba-Cu-O-Y, Lowest temperature of investigation, Y-x polyhedra

• Ba-Cu-Hg-O-Y
• Ba-Cu-O-Tl-Y
• Ba-Co-Cu-O-Y
• Ba-Cu-O-Pr-Y
• disordered
• oxide
• chalcogen
• alkaline
• rare earth
• tetragonal
• orthorhombic