Conductivity or resistivity, Er-x polyhedra, Rare earth

• Ba-Cu-Er-O
• Er-Si
• Co-Er
• B-C-Er-Ni
• Er-H
• electrical resistivity
• electrical conductivity
• field dependence of resistivity
• temperature derivative of resistivity
• rare earth
• lanthanoid
• transitional
• non-disordered
• metal
• cubic
• orthorhombic
• tetragonal
• hexagonal
• monoclinic