Chalcogen, Oxide, Transitional, Katiyar, Phonons

• Fe-Nb-O-Pb
• Bi-Fe-O
• Bi-Nd-O-Ti
• O-Zn
• Fe-O-Pb-Ta
• wavenumber of optical phonon
• Raman spectra
• wavenumber of transverse optical phonon
• wavenumber of longitudinal optical phonon
• transitional
• oxide
• chalcogen
• disordered
• ferroelectric
• tetragonal
• monoclinic
• hexagonal
• cubic
• orthorhombic