Chalcogen, Conductor, Oxide, Transitional, Phonons, Trigonal

• Bi-Fe-O
• Li-Nb-O
• Fe-O
• Bi-Na-O-Ti
• Cr-Cu-O
• Raman spectra
• wavenumber of optical phonon
• infrared spectra
• wavenumber of longitudinal optical phonon
• vibrational spectra
• transitional
• chalcogen
• conductor
• oxide
• semiconductor