Chalcogen, Conductor, Disordered, Optical properties, Orthorhombic

• Ba-Cu-O-Y
• Ca-La-Mn-O
• Fe-La-O
• Bi-Ca-Cu-O-Sr
• Fe-Se
• phonons
• optical spectra
• wavenumber of optical phonon
• Raman spectra
• reflectivity
• chalcogen
• conductor
• disordered
• transitional
• oxide