Chalcogen, Conductor, Disordered, Wavenumber of longitudinal optical phonon

• Ba-Cu-O-Y
• Ga-Se-Tl
• Ga-S-Tl
• Cu-La-O
• K-Li-O-S
• chalcogen
• disordered
• conductor
• transitional
• semiconductor
• tetragonal
• cubic
• orthorhombic
• monoclinic
• trigonal