Er-x polyhedra, Rare earth, Transitional, Structural properties

• Er-Fe
• Co-Er
• Er-Ni
• B-Er-Fe-Mn
• Ba-Cu-Er-O
• thermal and thermodynamic properties
• thermal expansion
• cell volume change
• transitional
• rare earth
• lanthanoid
• ternary
• hexagonal
• tetragonal
• cubic
• orthorhombic
• trigonal