Ag2Pb7Ge4S16 cI140 220

• Ag-Ge-Pb-Se
• Ag-Ge-Pb-S
• Ag-Eu-Ge-S
• Ge-Na-Pb-Se
• Cu-Ge-Pb-S
• optical properties
• phonons
• structural properties
• wavenumber of longitudinal optical phonon
• electronic energy gap
• metalloid
• chalcogen
• quaternary
• disordered
• tripolyhedral
• cubic