Chalcogen, Sulfide, Transitional, Fusion, S-Ta

• Nb-S-Ta
• K-S-Ta
• Ni-S-Ta
• S-Se-Ta
• temperature for congruent melting
• sulfide
• transitional
• chalcogen
• disordered
• hexagonal
• orthorhombic
• monoclinic
• trigonal
• tetragonal