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Nb-x polyhedra, Optical properties, Transitional, 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
transitional
chalcogen
oxide
disordered
non-disordered