Chalcogen, Disordered, Electron concentration

• Pb-Te
• Ba-Cu-O-Y
• O-Zn
• Sn-Te
• Cd-Hg-Te
• disordered
• chalcogen
• transitional
• conductor
• non-disordered
• cubic
• tetragonal
• orthorhombic
• trigonal
• hexagonal