F-x polyhedra, Halogen, Phase transitions, Trigonal

• Ce-F
• F-La
• F-K-Sn
• F-Sm
• F-Fe-H-O-Si
• fusion
• temperature for congruent melting
• structural transitions
• temperature for structural transition
• pressure for structural transition
• halogen
• fluoride
• non-disordered
• transitional