H-N-O-Se, Phase transitions, Pnictogen, Se-x polyhedra

• H-N-Na-O-Se
• H-N-O-Se-V
• H-N-O-Se-Te
• C-H-N-O-Se-U
• fusion
• temperature for congruent melting
• structural transitions
• temperature for structural transition
• decomposition
• pnictogen
• chalcogen
• non-disordered
• tetraoxoselenate
• monoclinic
• triclinic
• orthorhombic
• trigonal
• hexagonal