Alkali, Chalcogen, Transitional, Energy gap for direct transition

• Cs-Tb-Te-Zn
• Cs-Hg-Se-Y
• Cd-Cs-Se-Y
• B-Li-Na-O-Zn
• Ag-Cs-S-U
• chalcogen
• transitional
• alkali
• non-disordered
• conductor
• orthorhombic
• trigonal
• monoclinic
• tetragonal
• hexagonal