Electronic and electrical properties, Er-x polyhedra, Rare earth, Transitional

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