Antiferroelectric, Oxide, Bi-Fe-O, Phonons, Trigonal

• Bi-Fe-O-Y
• Raman spectra
• wavenumber of optical phonon
• infrared spectra
• wavenumber of transverse optical phonon
• wavenumber of longitudinal optical phonon
• disordered
• antiferromagnetic
• chalcogen
• antiferroelectric
• ferroelectric