Tcherepanov

• Ag-Ca-O-V
• Ca-Na-O-V
• Na-O-Sr-V
• Ag-O-Sr-V
• optical properties
• electronic and electrical properties
• phonons
• values of luminescence
• wavenumber of optical phonon
• conductor
• chalcogen
• non-disordered
• quaternary
• transitional
• tetragonal