1967, Chalcogen

• H-K-O-P
• Fe-S
• Te
• O-V
• Fe-Ni-S
• structural properties
• phase transitions
• phase diagram
• electronic and electrical properties
• chalcogen
• transitional
• non-disordered
• ternary
• disordered
• cubic
• orthorhombic
• trigonal
• monoclinic
• tetragonal