B-H, B-x polyhedra, Electronic energy gap

• B-Ca-H-O
• B-H-Na-O
• B-H-K-O
• B-H-Mg-O
• values of electronic energy gap
• energy gap for direct transition
• energy gap for indirect transition
• metalloid
• non-disordered
• chalcogen
• borate
• monoclinic
• orthorhombic
• triclinic
• trigonal
• cubic