Chalcogen, Disordered, Transitional, Structural transition

• Ge-K-Na-Nb-O
• Fe-Se-Te
• Bi-O-Sr-Ta
• Fe-K-Se
• Fe-Se
• transitional
• disordered
• chalcogen
• oxide
• conductor
• tetragonal
• cubic
• orthorhombic
• monoclinic
• trigonal