Alkaline, Disordered, Oxide, 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-Mg-O-Tl
• phonons
• wavenumber of optical phonon
• optical absorption
• infrared spectra
• oxide
• disordered
• chalcogen
• alkaline
• transitional
• orthorhombic
• tetragonal
• cubic
• hexagonal
• trigonal