Alkaline, Transitional, Optical properties, Trigonal

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