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Phonons, Tetragonal
Ba-Cu-O-Y
O-Ti
Fe-K-Se
Ba-Ca-Cu-O-Tl
Cu-La-O-Sr
Raman spectra
vibrational spectra
wavenumber of optical phonon
infrared spectra
wavenumber of longitudinal optical phonon
transitional
chalcogen
non-disordered
ternary
disordered