Nb-U, Radioactive, Transitional, Structural properties

• Nb-O-U
• Ca-Fe-Nb-O-Ta-U-Y
• Ca-Ce-Fe-Nb-O-Ta-U
• Ca-Er-Fe-Nb-O-Ta-U
• Ca-Dy-Fe-Nb-O-Ta-U
• radioactive
• transitional
• actinoid
• chalcogen
• orthorhombic
• cubic
• tetragonal
• hexagonal
• monoclinic