Chalcogen, Disordered, Structural transition

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