Nb-x polyhedra, Oxide, Transitional, Phase transitions

• Mg-Nb-O-Pb-Ti
• Na-Nb-O
• K-Nb-O
• Ag-Nb-O
• K-Na-Nb-O
• fusion
• temperature for congruent melting
• structural transitions
• temperature for structural transition
• pressure for structural transition
• oxide
• chalcogen
• transitional
• disordered
• cubic
• orthorhombic
• tetragonal
• monoclinic
• trigonal