Optical properties, R3c

• Bi-Fe-O
• Li-Nb-O
• B-Ba-Na-O
• Bi-Fe-Nd-O
• Bi-Fe-La-O
• phonons
• Raman spectra
• wavenumber of optical phonon
• luminescence
• optical spectra
• chalcogen
• transitional
• disordered
• oxide
• pnictogen
• trigonal
• cubic