Chalcogen, Disordered, Transitional, Khan, Optical properties

• Ba-Ca-Cu-O-Tl
• Eu-O-Sm-V-Y
• Bi-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
• transitional
• disordered
• oxide
• conductor
• tetragonal
• orthorhombic
• cubic
• trigonal
• hexagonal