Electronic energy gap, Ge-O, Trigonal

• B-Ge-O-Pr
• Ca-Ge-O-Pb
• Al-Ge-Li-O-P
• B-Ge-Nd-O
• Ge-La-O-Sb
• values of electronic energy gap
• energy gap for direct transition
• chalcogen
• metalloid
• oxide
• disordered