Alkaline, Disordered, Transitional, Optical properties, Trigonal

• La-Mn-O-Sr
• Ca-Mn-O
• Li-Mg-Nb-O
• Ba-F-Mn-Si
• Co-La-Mn-O-Sr
• phonons
• luminescence
• optical spectra
• Raman spectra
• wavenumber of optical phonon
• disordered
• alkaline
• transitional
• chalcogen
• rare earth