Chalcogen, Optics

• Ba-Cu-O-Y
• O-Zn
• Fe-O
• O-V
• O-Ti
• phonons
• optical spectra
• luminescence
• wavenumber of optical phonon
• optical absorption
• chalcogen
• transitional
• non-disordered
• disordered
• nonmetal
• cubic
• orthorhombic
• monoclinic
• tetragonal
• trigonal