Electronic and electrical properties, Er-x polyhedra

• Ba-Cu-Er-O
• Er-Si
• Co-Er
• Er-Mn-O
• Er-H
• electrical conductivity
• effective mass
• electronic energy gap
• values of electronic energy gap
• conductivity or resistivity
• rare earth
• lanthanoid
• transitional
• non-disordered
• cubic
• orthorhombic
• hexagonal
• tetragonal
• monoclinic