Alkali, Oxide, Na-Nb-O, Temperature for congruent melting

• K-Na-Nb-O
• Na-Nb-O-Sr
• Ag-Na-Nb-O
• Bi-K-Na-Nb-O-Ti
• transitional
• oxide
• alkali
• chalcogen
• tetragonal
• orthorhombic
• cubic
• monoclinic
• trigonal