El azrak

• Ba-Cu-O-Y
• Bi-Ca-Cu-O-Pb-Sr
• Bi-Ca-Cu-O-Sr
• Ba-Cu-Gd-O
• optical properties
• electronic and electrical properties
• optical conductivity
• permittivity (dielectric constant)
• reflectivity
• high-tc superconductor
• chalcogen
• diamagnetic
• conductor
• alkaline
• orthorhombic
• monoclinic