Chalcogen, Rare earth, O-Pm, Structural properties

• Ba-Cu-Er-O
• Ba-Cu-Eu-O
• Ba-Ce-Cu-O
• Ba-Cu-Dy-O
• Ba-Cu-Gd-O
• rare earth
• chalcogen
• transitional
• quaternary
• alkaline
• monoclinic
• cubic
• trigonal
• triclinic