Alkali, Transitional, Energy gap for direct transition

• Cl-K-Zn
• As-K-Zn
• Ag-C-Cs
• As-Li-Zn
• Au-Cs
• alkali
• transitional
• non-disordered
• chalcogen
• ternary
• orthorhombic
• tetragonal
• trigonal
• cubic
• hexagonal