Chalcogen, Nb-x polyhedra, Real part of permittivity

• Mg-Nb-O-Pb
• Mg-Nb-O-Pb-Ti
• Li-Nb-O
• Na-Nb-O
• Bi-Nb-O-Sr
• chalcogen
• transitional
• disordered
• nonmetal
• oxide
• cubic
• tetragonal
• orthorhombic
• trigonal
• monoclinic