Birefringent, Non-disordered, Optical properties, Trigonal

• Li-Nb-O
• Ni-O
• B-Ba-O
• Ce-F
• C-Mg-O
• phonons
• optical spectra
• optical absorption
• refractive index
• wavenumber of optical phonon
• nonmetal
• birefringent
• non-disordered
• chalcogen
• disordered