Birefringent, Nonmetal, Transitional, Optical properties, Trigonal

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