Chalcogen, Katsui

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