Rare earth, Structural properties, Sustef

• Ba-Cu-O-Y
• Ba-Ca-Cu-Gd-O-Pr
• As-F-Fe-O-Sm
• Ba-Ca-Cu-Hg-O-Tl-Y
• Ba-Ca-Cu-La-Nd-O
• rare earth
• transitional
• chalcogen
• lanthanoid
• alkaline
• tetragonal
• orthorhombic
• trigonal
• hexagonal
• cubic