Chalcogen, N-Na-O, N-x polyhedra, Phase transitions

• C-H-N-Na-O
• H-N-Na-O-P
• H-N-Na-O-Se
• Al-N-Na-O-Si
• fusion
• temperature for congruent melting
• structural transitions
• temperature for structural transition
• decomposition
• pnictogen
• chalcogen
• alkali
• non-disordered
• monoclinic
• orthorhombic
• triclinic
• trigonal
• cubic