Alkali, Li-Nb-O, Optical properties, Trigonal

• Li-Mg-Nb-O
• Li-Na-Nb-O
• Fe-Li-Nb-O
• Dy-Li-Nb-O
• phonons
• optical absorption
• wavenumber of optical phonon
• luminescence
• Raman spectra
• transitional
• oxide
• chalcogen
• alkali
• nonmetal