Eu3AuO6 crystallizes in the triclinic P-1 space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 7-coordinate geometry to two equivalent O(2), two equivalent O(3), and three equivalent O(1) atoms. In the second Eu site, Eu(2) is bonded in a 6-coordinate geometry to two equivalent O(2) and four equivalent O(3) atoms. Au(1) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to three equivalent Eu(1) and one Au(1) atom. In the second O site, O(2) is bonded to one Eu(2), two equivalent Eu(1), and one Au(1) atom to form OEu3Au tetrahedra that share corners with four equivalent O(2)Eu3Au tetrahedra, corners with four equivalent O(3)Eu4 tetrahedra, and edges with two equivalent O(3)Eu4 tetrahedra. In the third O site, O(3) is bonded to two equivalent Eu(1) and two equivalent Eu(2) atoms to form OEu4 tetrahedra that share corners with four equivalent O(2)Eu3Au tetrahedra, corners with four equivalent O(3)Eu4 tetrahedra, edges with two equivalent O(2)Eu3Au tetrahedra, and edges with two equivalent O(3)Eu4 tetrahedra.
Eu3AuO6 crystallizes in the triclinic P-1 space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 7-coordinate geometry to two equivalent O(2), two equivalent O(3), and three equivalent O(1) atoms. There is one shorter (2.38 Å) and one longer (2.40 Å) Eu(1)-O(2) bond length. There is one shorter (2.27 Å) and one longer (2.36 Å) Eu(1)-O(3) bond length. There are a spread of Eu(1)-O(1) bond distances ranging from 2.40-2.55 Å. In the second Eu site, Eu(2) is bonded in a 6-coordinate geometry to two equivalent O(2) and four equivalent O(3) atoms. Both Eu(2)-O(2) bond lengths are 2.36 Å. There are two shorter (2.35 Å) and two longer (2.36 Å) Eu(2)-O(3) bond lengths. Au(1) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Au(1)-O(1) bond lengths are 2.01 Å. Both Au(1)-O(2) bond lengths are 2.00 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to three equivalent Eu(1) and one Au(1) atom. In the second O site, O(2) is bonded to one Eu(2), two equivalent Eu(1), and one Au(1) atom to form OEu3Au tetrahedra that share corners with four equivalent O(2)Eu3Au tetrahedra, corners with four equivalent O(3)Eu4 tetrahedra, and edges with two equivalent O(3)Eu4 tetrahedra. In the third O site, O(3) is bonded to two equivalent Eu(1) and two equivalent Eu(2) atoms to form OEu4 tetrahedra that share corners with four equivalent O(2)Eu3Au tetrahedra, corners with four equivalent O(3)Eu4 tetrahedra, edges with two equivalent O(2)Eu3Au tetrahedra, and edges with two equivalent O(3)Eu4 tetrahedra.