Chalcogen, Katsui

• Ba-Cu-Eu-O
• Ba-O-Ti
• Ba-Bi-O-Pb
• Ba-O-Pb
• Cu-Se-Sn-Zn
• electronic and electrical properties
• conductivity or resistivity
• optical properties
• superconductivity
• electrical resistivity
• chalcogen
• conductor
• disordered
• non-disordered
• alkaline
• monoclinic
• orthorhombic
• tetragonal
• triclinic
• cubic