Chalcogen, Lanthanoid, Er-O, Orthorhombic

• Ba-Cu-Er-O
• Er-Fe-O
• Er-Mn-O
• Cu-Er-O
• Er-Fe-Mn-O
• thermal and thermodynamic properties
• magnetic properties
• electronic and electrical properties
• structural properties
• superconductivity
• rare earth
• lanthanoid
• chalcogen
• transitional
• oxide