Alkaline, Chalcogen, Transitional, Optical properties, Trigonal

• La-Mn-O-Sr
• Ca-Mn-O
• Li-Mg-Nb-O
• Ca-Cu-O-Ti
• Ba-O-Ti
• phonons
• luminescence
• optical spectra
• Raman spectra
• photoluminescence spectra
• transitional
• chalcogen
• alkaline
• disordered
• rare earth