Alkali, Chalcogen, Transitional, Phonons, Trigonal

• Li-Nb-O
• Bi-Na-O-Ti
• Fe-K-Mo-O
• Li-O-Ta
• Na-O-P-Zr
• infrared spectra
• Raman spectra
• wavenumber of optical phonon
• vibrational spectra
• wavenumber of longitudinal optical phonon
• transitional
• chalcogen
• alkali
• disordered
• non-disordered