Alkali, Chalcogen, Disordered, Phonons, Tetragonal

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