Alkaline, Chalcogen, Disordered, Oxide, Phonons, Trigonal

• La-Mn-O-Sr
• Ca-Mn-O
• Ba-Co-La-O
• Ba-Bi-Co-Fe-O
• Ba-Ca-Nb-O
• Raman spectra
• wavenumber of optical phonon
• infrared spectra
• vibrational spectra
• energy of optical phonon
• oxide
• disordered
• alkaline
• chalcogen
• transitional