Electronic and electrical properties, Er-x polyhedra, Non-disordered

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