Chalcogen, Conductor, Disordered, Transitional, Phonons, Tetragonal

• O-Ti
• Ba-O-Ti
• Cu-La-O
• O-Pb-Ti
• Ba-Cu-O-Y
• Raman spectra
• wavenumber of optical phonon
• infrared spectra
• wavenumber of longitudinal optical phonon
• vibrational spectra
• transitional
• conductor
• chalcogen
• disordered
• semiconductor