Chalcogen, Disordered, Transitional, Khasanov

• La-O-Pb-Ti-Zr
• Fe-Se
• Fe-Se-Te
• Fe-Rb-Se
• Ba-Cu-La-O
• magnetic properties
• structural properties
• superconductivity
• resonance spectra
• muon spin spectra
• disordered
• chalcogen
• transitional
• conductor
• metal
• tetragonal
• orthorhombic
• trigonal
• monoclinic
• triclinic