Alkali, Ternary, Energy gap for indirect transition

• Na-O-Si
• F-K-Mg
• Cl-K-Zn
• Cl-K-Mg
• Bi-Rb-Se
• alkali
• ternary
• non-disordered
• transitional
• tetragonal
• cubic
• trigonal
• hexagonal
• orthorhombic