Chalcogen, Non-disordered, Ternary, Energy gap for direct transition

• Bi-Fe-O
• O-Sr-Ti
• Cu-Ga-Se
• Cu-In-Se
• Ag-Ga-Se
• ternary
• chalcogen
• non-disordered
• transitional
• conductor
• tetragonal
• trigonal
• cubic
• orthorhombic
• hexagonal