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Disordered, Nonmetal, Monoclinic, Phonons
Ga-S-Tl
K-Nb-S-Ta
Cu-O
H-N-O-Se
Bi-O-V
wavenumber of optical phonon
Raman spectra
wavenumber of longitudinal optical phonon
vibrational spectra
infrared spectra
disordered
nonmetal
chalcogen
transitional
quaternary