Alkaline, Chalcogen, Phonons, Trigonal

• La-Mn-O-Sr
• Ca-Mn-O
• Ba-O-V
• Ca-Cu-O-Ti
• As-Ca-O
• Raman spectra
• wavenumber of optical phonon
• infrared spectra
• vibrational spectra
• wavenumber of longitudinal optical phonon
• chalcogen
• alkaline
• transitional
• disordered
• oxide