Birefringent, Chalcogen, Nonmetal, Transitional, Phonons

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