Alkali, Chalcogen, Nonmetal, Temperature for structural transition

• K-Na-Nb-O
• H-Li-N-O-S
• Bi-Na-O-Ti
• K-Li-O-S
• H-K-O-P
• alkali
• nonmetal
• chalcogen
• ferroelectric
• transitional
• tetragonal
• orthorhombic
• monoclinic
• cubic
• trigonal