Alkali, Chalcogen, Disordered, Oxide, Fusion, Tetragonal

• Na-Nb-O-Sr
• K-Nb-O
• La-Li-O-Ti
• F-K-Nb-O
• Ba-Ca-Cu-O-Rb-Tl
• temperature for congruent melting
• oxide
• disordered
• alkali
• chalcogen