Ba-Cu-Er-O, Er-x polyhedra, Structural properties, Transitional

• Ba-Cu-Er-Ni-O
• Ba-Cu-Er-O-Zn
• Ba-Ca-Cu-Er-O
• Ba-Cu-Er-O-Pr
• lanthanoid
• chalcogen
• alkaline
• oxide
• orthorhombic
• tetragonal
• cubic
• monoclinic