Chalcogen, Conductor, Semiconductor, Wavenumber of optical phonon

• Ba-Cu-O-Y
• Bi-Fe-O
• O-Zn
• Fe-O
• Fe-Ni-O
• chalcogen
• semiconductor
• conductor
• transitional
• oxide
• cubic
• orthorhombic
• tetragonal
• trigonal
• monoclinic