Alkaline, Ternary, Energy gap for direct transition

• O-Sr-Ti
• Mg-O-Zn
• Mg-Se-Zn
• Bi-Ca-O
• Be-Se-Zn
• alkaline
• ternary
• non-disordered
• pnictogen
• cubic
• tetragonal
• trigonal
• hexagonal
• orthorhombic