Alkaline, Ternary, Energy gap for indirect transition

• O-Sr-Ti
• B-Ba-O
• O-Sr-Zr
• F-K-Mg
• Ba-O-Sn
• alkaline
• ternary
• non-disordered
• tripolyhedral
• cubic
• trigonal
• tetragonal
• hexagonal
• orthorhombic