Alkaline, Chalcogen, Semiconductor, Energy gap for direct transition

• Mg-O
• O-Sr-Ti
• Mg-O-Zn
• Ba-Cu-F-O-Y
• Ca-O
• semiconductor
• conductor
• chalcogen
• alkaline
• non-disordered
• cubic
• tetragonal
• orthorhombic
• monoclinic
• hexagonal