Chalcogen, Transitional, Spectra, Trigonal

• Bi-Fe-O
• Fe-O
• Fe-O-Ti
• Ni-O
• Fe-La-O-Sr
• optical properties
• phonons
• magnetic properties
• optical spectra
• Moessbauer spectra
• transitional
• chalcogen
• disordered
• non-disordered
• oxide