Eu-x polyhedra, Rare earth, Values of electronic energy gap

• Bi-Eu
• Cd-Eu-Sb
• Eu-Mo-O
• Eu-Gd-Ge
• Eu-Nb-O
• lanthanoid
• rare earth
• non-disordered
• chalcogen
• orthorhombic
• monoclinic
• tetragonal
• cubic
• hexagonal