Chalcogen, Rare earth, Ternary, Keller, Structural properties

• La-O-U
• Nd-Ni-O
• Ho-O-U
• Eu-O-U
• Er-La-O
• ternary
• chalcogen
• rare earth
• oxide
• cubic
• orthorhombic
• monoclinic
• trigonal
• tetragonal