1993, Chalcogen

• Ba-Cu-O-Y
• Cu-La-O
• Bi-Ca-Cu-O-Sr
• Ce-Cu-Nd-O
• Cu-La-O-Sr
• structural properties
• electronic and electrical properties
• magnetic properties
• conductivity or resistivity
• superconductivity
• chalcogen
• transitional
• disordered
• oxide
• non-disordered
• tetragonal
• orthorhombic
• cubic
• monoclinic
• trigonal