Chalcogen, Rare earth, Er-O

• Ba-Cu-Er-O
• Er-Mn-O
• Er-Fe-O
• Er-O-Ti
• thermal and thermodynamic properties
• structural properties
• electronic and electrical properties
• magnetic properties
• phase transitions
• chalcogen
• rare earth
• lanthanoid
• transitional
• oxide
• orthorhombic
• cubic
• monoclinic
• tetragonal
• trigonal