Disordered, Kim, Optical properties, Trigonal

• Bi-Fe-O
• Bi-Na-O-Ti
• Ba-Bi-Na-O-Ti-Zr
• Er-Fe-O
• Fe-Lu-O
• optical spectra
• phonons
• Raman spectra
• luminescence
• wavenumber of optical phonon
• disordered
• chalcogen
• transitional
• oxide
• nonmetal