Ba-Ca-Cu-O-Tl, Chalcogen, Disordered, Khan

• Ba-Be-Ca-Cu-O-Tl
• Ba-Ca-Cu-O-Ti-Tl
• Ba-Ca-Cu-Mg-O-Tl-Zn
• Ba-Ca-Cu-O-Tl-Zn
• superconductivity
• optical properties
• superconducting transition temperature
• values of superconducting transition temperature
• phonons
• disordered
• high-tc superconductor
• alkaline
• chalcogen
• transitional
• tetragonal
• orthorhombic