Mg-Nb-O-Pb, Nb-x polyhedra, Phase transitions

• Mg-Nb-O-Pb-Ti
• Bi-Mg-Nb-O-Pb
• Cd-Mg-Nb-O-Pb
• Mg-Nb-O-Pb-Ta-Zn
• structural transitions
• temperature for structural transition
• temperature for congruent melting
• fusion
• transitional
• disordered
• alkaline
• chalcogen
• nonmetal
• cubic
• tetragonal
• monoclinic
• orthorhombic
• trigonal