Birefringent, Chalcogen, Non-disordered, Nonmetal, Phonons

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