Ba-Cu-O-Y, Chalcogen, High-tc superconductor, Charge

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