Conductor, Disordered, Transitional, Optical properties, Trigonal

• Bi-Fe-O
• Fe-O
• Li-Nb-O
• Li-O-Ta
• La-Mn-O-Sr
• phonons
• optical spectra
• Raman spectra
• optical absorption
• wavenumber of optical phonon
• conductor
• disordered
• transitional
• chalcogen
• semiconductor