K2CuNbSe4 oF64 70

• Ag-Cs-S-V
• Ag-Nb-Rb-S
• Ag-K-Se-V
• Ag-Rb-Se-V
• Ag-Nb-Rb-Se
• structural properties
• values of electronic energy gap
• electronic and electrical properties
• electronic energy gap
• optical properties
• alkali
• non-disordered
• chalcogen
• quaternary
• transitional
• orthorhombic