Fe-O, Optics, Transitional, Trigonal

• Bi-Fe-O
• Fe-K-Mo-O
• Fe-Mo-O-Rb
• Fe-O-Ti
• phonons
• optical spectra
• wavenumber of optical phonon
• Raman spectra
• optical absorption
• transitional
• chalcogen
• antiferromagnetic
• disordered
• oxide