Alkali, Ternary, Energy gap for direct transition

• Cl-Cs-Ge
• Cs-I-Sb
• Br-Cs-Ge
• Cl-K-Zn
• As-K-Zn
• alkali
• ternary
• non-disordered
• transitional
• tetragonal
• cubic
• trigonal
• hexagonal
• orthorhombic