Chalcogen, Deuterium, Temperature for structural transition

• H-N-O-Se
• Cl-H-N-Te
• H-K-O-P
• As-H-K-O
• Cs-H-O-P
• deuterium
• chalcogen
• quaternary
• nonmetal
• pnictogen
• monoclinic
• orthorhombic
• tetragonal
• cubic
• triclinic