Alkali, Chalcogen, Disordered, Transitional, Phonons, Tetragonal

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