Nb-x polyhedra, Optical properties, Oxide, Trigonal

• Li-Nb-O
• Li-Mg-Nb-O
• Ba-Nb-O-Pr-Sn
• Na-Nb-O
• Fe-Li-Nb-O
• phonons
• wavenumber of optical phonon
• optical absorption
• Raman spectra
• reflectivity
• oxide
• chalcogen
• transitional
• disordered
• ferroelectric