Chalcogen, Conductor, Khan, Optical properties

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