Chalcogen, Conductor, Disordered, Semiconductor, Phonons, Trigonal

• Bi-Fe-O
• Li-Nb-O
• Fe-O
• Bi-Na-O-Ti
• Bi-Se
• Raman spectra
• wavenumber of optical phonon
• infrared spectra
• energy of optical phonon
• wavenumber of longitudinal optical phonon
• semiconductor
• conductor
• disordered
• chalcogen
• transitional