Ba-Cu-O-Y, Chalcogen, Charge, Orthorhombic

• Ba-Ca-Cu-O-Y
• Ba-Cu-O-Y-Zn
• Ba-Cu-Fe-O-Y
• Ba-Cu-O-Pr-Y
• electronic and electrical properties
• charge carrier concentration
• valence or charge transfer
• transitional
• alkaline
• chalcogen
• rare earth
• high-tc superconductor