Chalcogen, Disordered, Oxide, Transitional, Khan, Optical properties

• Ba-Ca-Cu-O-Tl
• Ba-Ca-Cu-O-Ti-Tl
• Ba-Be-Ca-Cu-O-Tl
• Ba-Ca-Cu-Mg-O-Ti-Tl
• Ba-Ca-Cd-Cu-O-Tl
• phonons
• wavenumber of optical phonon
• optical absorption
• infrared spectra
• optical spectra
• oxide
• transitional
• disordered
• chalcogen
• conductor
• orthorhombic
• cubic
• tetragonal
• trigonal
• hexagonal