Energy gap for direct transition, Non-disordered, Rare earth, Transitional

• Ba-Cu-F-O-Y
• Cs-Hg-Se-Y
• Co-La-O
• Cd-Cs-Se-Y
• Cs-Tb-Te-Zn
• non-disordered
• transitional
• rare earth
• chalcogen
• lanthanoid
• orthorhombic
• trigonal
• cubic
• tetragonal
• hexagonal