Van der maas

• In-K-O-W
• Ba-Cu-O-Y
• Bi-Na-O-W
• Bi-Mo-Na-O
• Bi-Li-O-W
• optical properties
• phonons
• wavenumber of longitudinal optical phonon
• structural properties
• Raman spectra
• transitional
• quaternary
• chalcogen
• alkali
• non-disordered
• orthorhombic
• tetragonal
• monoclinic
• trigonal