Antiferroelectric, Disordered, Optical properties, Trigonal

• Bi-Fe-O
• Bi-Na-O-Ti
• Bi-Fe-O-Y
• Bi-Er-Na-O-Ti
• B-Fe-Gd-O
• phonons
• Raman spectra
• wavenumber of optical phonon
• optical spectra
• luminescence
• chalcogen
• antiferroelectric
• disordered
• transitional
• ferroelectric