Energy gap for direct transition, Rare earth, Transitional

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