Ba-Cu-Fe-O-Y, Crystalline structure, Transitional

• Ba-Ca-Cu-Fe-O-Y
• Ba-Cu-Fe-O-Sr-Y
• Ba-Co-Cu-Fe-O-Y
• Ba-Cu-Fe-O-Pr-Y
• transitional
• rare earth
• alkaline
• chalcogen
• quinary
• tetragonal
• orthorhombic