Alkaline, Transitional, Effective mass of electrons

• Nb-O-Sr-Ti
• Ba-Cu-O-Y
• O-Ru-Sr
• Fe-Sb-Sr
• As-Ba-Fe
• alkaline
• transitional
• conductor
• metal
• chalcogen
• cubic
• tetragonal
• orthorhombic
• monoclinic
• hexagonal