Chalcogen, Phase transitions, Se-Ta, Se-x polyhedra

• I-Se-Ta
• Ni-Se-Ta
• S-Se-Ta
• Se-Ta-Tl
• fusion
• temperature for congruent melting
• structural transitions
• temperature for structural transition
• pressure for structural transition
• transitional
• chalcogen
• selenide
• non-disordered
• hexagonal
• monoclinic
• orthorhombic
• trigonal
• triclinic