Electronic energy gap, Tetragonal, Y-x polyhedra

• Pt-Si-U
• Ce-Cu-Fe-O-Sr-Y
• In-Ni-Y
• Ba-Cu-O-Y
• In-Ir-Y
• values of electronic energy gap
• energy gap for direct transition
• charge-transfer energy
• energy gap for indirect transition
• transitional
• rare earth
• disordered
• chalcogen