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

• O-Sr-Ti
• I-S-Sb
• In-S-Tl
• Cu-Ga-Se
• Ga-Se-Tl
• ternary
• chalcogen
• non-disordered
• transitional
• conductor
• tetragonal
• trigonal
• cubic
• orthorhombic
• monoclinic