Boukhari, Chalcogen, Lanthanoid, Nonmetal

• Dy-Fe-Na-Nb-O-Pb
• Fe-La-Na-Nb-O-Pb
• Fe-Na-Nb-O-Pb-Sm
• B-Nd-O-Si
• Eu-Fe-Na-Nb-O-Pb
• electronic and electrical properties
• permittivity (dielectric constant)
• optical properties
• structural transitions
• temperature for structural transition
• rare earth
• nonmetal
• lanthanoid
• chalcogen
• transitional
• orthorhombic
• tetragonal
• trigonal