Alkali, Oxide, Ternary, Transitional, Na-Nb-O, Phase transitions

• structural transitions
• temperature for structural transition
• fusion
• temperature for congruent melting
• pressure for structural transition
• ternary
• oxide
• alkali
• chalcogen
• transitional
• orthorhombic
• trigonal
• tetragonal
• monoclinic
• cubic