Chalcogen, Disordered, Khan, Optical properties

• Ba-Ca-Cu-O-Tl
• Bi-Eu-O-Sm-V-Y
• Eu-O-Sm-V-Y
• Ba-Ca-Cu-O-Ti-Tl
• Ba-Be-Ca-Cu-O-Tl
• phonons
• wavenumber of optical phonon
• optical absorption
• infrared spectra
• luminescence
• chalcogen
• disordered
• transitional
• oxide
• conductor
• tetragonal
• orthorhombic
• cubic
• trigonal
• hexagonal