Chalcogen, Conductor, Phonons

• Ba-Cu-O-Y
• Bi-Fe-O
• O-Zn
• Ba-O-Ti
• Fe-O
• Raman spectra
• wavenumber of optical phonon
• infrared spectra
• vibrational spectra
• wavenumber of longitudinal optical phonon
• chalcogen
• conductor
• transitional
• semiconductor
• disordered
• cubic
• orthorhombic
• tetragonal
• monoclinic
• trigonal