Birefringent, Chalcogen, Transitional, Phonons

• Li-Nb-O
• Gd-Mo-O
• Ag-Ga-S
• B-Cu-O
• Cd-Se
• Raman spectra
• wavenumber of optical phonon
• infrared spectra
• vibrational spectra
• Brillouin spectra
• transitional
• chalcogen
• birefringent
• nonmetal
• non-disordered
• tetragonal
• trigonal
• orthorhombic
• hexagonal
• cubic