Chalcogen, Conductor, Oxide, Transitional, Khan, Optical properties

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