Chalcogen, Er-O-Ta, Er-x polyhedra, Monoclinic

• Cs-Er-H-K-O-Se-Ta
• Er-H-O-P-Ta-W
• magnetic properties
• thermal and thermodynamic properties
• structural properties
• magnetization
• values of magnetization
• rare earth
• lanthanoid
• chalcogen
• oxide
• transitional