Disordered, Electronic energy gap, O-Si, Trigonal

• Ba-Eu-N-O-Si
• Ba-N-O-Si
• Al-N-Nd-O-Si
• Al-H-Mg-O-Si
• Al-Ca-O-Si
• values of electronic energy gap
• energy gap for direct transition
• energy gap for indirect transition
• metalloid
• disordered
• chalcogen
• silicate