Chalcogen, Fusion, Nb

• Nb-O
• Ba-Nb-O
• Na-Nb-O
• Nb-O-Sr
• K-Nb-O
• temperature for congruent melting
• chalcogen
• transitional
• oxide
• disordered
• cubic
• tetragonal
• orthorhombic
• monoclinic
• trigonal