UErN2 is Caswellsilverite-like structured and crystallizes in the tetragonal P4/mmm space group. U(1) is bonded to two equivalent N(1) and four equivalent N(2) atoms to form UN6 octahedra that share corners with six equivalent U(1)N6 octahedra, edges with four equivalent U(1)N6 octahedra, and edges with eight equivalent Er(1)N6 octahedra. The corner-sharing octahedra are not tilted. Er(1) is bonded to two equivalent N(2) and four equivalent N(1) atoms to form ErN6 octahedra that share corners with six equivalent Er(1)N6 octahedra, edges with four equivalent Er(1)N6 octahedra, and edges with eight equivalent U(1)N6 octahedra. The corner-sharing octahedra are not tilted. There are two inequivalent N sites. In the first N site, N(1) is bonded to two equivalent U(1) and four equivalent Er(1) atoms to form NEr4U2 octahedra that share corners with six equivalent N(1)Er4U2 octahedra, edges with four equivalent N(1)Er4U2 octahedra, and edges with eight equivalent N(2)Er2U4 octahedra. The corner-sharing octahedra are not tilted. In the second N site, N(2) is bonded to four equivalent U(1) and two equivalent Er(1) atoms to form NEr2U4 octahedra that share corners with six equivalent N(2)Er2U4 octahedra, edges with four equivalent N(2)Er2U4 octahedra, and edges with eight equivalent N(1)Er4U2 octahedra. The corner-sharing octahedra are not tilted.
UErN2 is Caswellsilverite-like structured and crystallizes in the tetragonal P4/mmm space group. U(1) is bonded to two equivalent N(1) and four equivalent N(2) atoms to form UN6 octahedra that share corners with six equivalent U(1)N6 octahedra, edges with four equivalent U(1)N6 octahedra, and edges with eight equivalent Er(1)N6 octahedra. The corner-sharing octahedra are not tilted. Both U(1)-N(1) bond lengths are 2.41 Å. All U(1)-N(2) bond lengths are 2.43 Å. Er(1) is bonded to two equivalent N(2) and four equivalent N(1) atoms to form ErN6 octahedra that share corners with six equivalent Er(1)N6 octahedra, edges with four equivalent Er(1)N6 octahedra, and edges with eight equivalent U(1)N6 octahedra. The corner-sharing octahedra are not tilted. Both Er(1)-N(2) bond lengths are 2.41 Å. All Er(1)-N(1) bond lengths are 2.43 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded to two equivalent U(1) and four equivalent Er(1) atoms to form NEr4U2 octahedra that share corners with six equivalent N(1)Er4U2 octahedra, edges with four equivalent N(1)Er4U2 octahedra, and edges with eight equivalent N(2)Er2U4 octahedra. The corner-sharing octahedra are not tilted. In the second N site, N(2) is bonded to four equivalent U(1) and two equivalent Er(1) atoms to form NEr2U4 octahedra that share corners with six equivalent N(2)Er2U4 octahedra, edges with four equivalent N(2)Er2U4 octahedra, and edges with eight equivalent N(1)Er4U2 octahedra. The corner-sharing octahedra are not tilted.