Alkaline, Disordered, Rare earth, Transitional, Phonons, Trigonal

• La-Mn-O-Sr
• Ba-Co-La-O
• B-O-Sr-Y
• B-Ba-O-Y
• Ca-La-Mn-O
• Raman spectra
• wavenumber of optical phonon
• infrared spectra
• wavenumber of longitudinal optical phonon
• vibrational spectra
• rare earth
• disordered
• alkaline
• chalcogen
• transitional