Chalcogen, Conductor, Semiconductor, Wavenumber of longitudinal optical phonon

• Ba-Cu-O-Y
• In-S-Tl
• Ga-Se-Tl
• Ga-S-Tl
• Fe-H-K-Mo-O
• chalcogen
• conductor
• semiconductor
• transitional
• oxide
• tetragonal
• monoclinic
• cubic
• orthorhombic
• hexagonal