Alkali, Disordered, Nonmetal, Transitional, Phonons, Tetragonal

• Bi-Na-O-W
• Ce-Li-Mo-O
• Bi-Na-O-Ti
• Na-O-P-Zn
• K-Mn-Nb-O-P
• Raman spectra
• wavenumber of optical phonon
• infrared spectra
• vibrational spectra
• wavenumber of longitudinal optical phonon
• transitional
• alkali
• nonmetal
• disordered
• chalcogen