Birefringent, Chalcogen, Disordered, Optical properties, Trigonal

• Li-Nb-O
• Ni-O
• Li-Mg-Nb-O
• Ga-La-O-Si
• C-Mg-O
• phonons
• optical absorption
• refractive index
• optical spectra
• wavenumber of optical phonon
• nonmetal
• birefringent
• disordered
• chalcogen
• transitional