Er2Os3Ga10 crystallizes in the tetragonal P4/mbm space group. Er(1) is bonded in a 14-coordinate geometry to two equivalent Os(1); two equivalent Os(2); two equivalent Ga(2); and eight Ga(1,1) atoms. There are two inequivalent Os sites. In the first Os site, Os(1) is bonded to two equivalent Er(1); two equivalent Ga(2); and eight Ga(1,1) atoms to form distorted OsEr2Ga10 cuboctahedra that share corners with two equivalent Os(1)Er2Ga10 cuboctahedra, edges with five equivalent Os(1)Er2Ga10 cuboctahedra, and faces with four equivalent Os(2)Er4Ga8 cuboctahedra. In the second Os site, Os(2) is bonded to four equivalent Er(1) and eight Ga(1,1) atoms to form distorted OsEr4Ga8 cuboctahedra that share corners with four equivalent Os(2)Er4Ga8 cuboctahedra and faces with eight equivalent Os(1)Er2Ga10 cuboctahedra. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 10-coordinate geometry to two equivalent Er(1), one Os(2), two equivalent Os(1), one Ga(2), and four equivalent Ga(1) atoms. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to two equivalent Er(1); two equivalent Os(1); one Ga(2); and four Ga(1,1) atoms. In the third Ga site, Ga(1) is bonded in a 10-coordinate geometry to two equivalent Er(1); one Os(2); two equivalent Os(1); one Ga(2); and four Ga(1,1) atoms.
Er2Os3Ga10 crystallizes in the tetragonal P4/mbm space group. Er(1) is bonded in a 14-coordinate geometry to two equivalent Os(1); two equivalent Os(2); two equivalent Ga(2); and eight Ga(1,1) atoms. Both Er(1)-Os(1) bond lengths are 3.18 Å. Both Er(1)-Os(2) bond lengths are 3.22 Å. Both Er(1)-Ga(2) bond lengths are 2.90 Å. There are four shorter (2.93 Å) and four longer (3.00 Å) Er(1)-Ga(1,1) bond lengths. There are two inequivalent Os sites. In the first Os site, Os(1) is bonded to two equivalent Er(1); two equivalent Ga(2); and eight Ga(1,1) atoms to form distorted OsEr2Ga10 cuboctahedra that share corners with two equivalent Os(1)Er2Ga10 cuboctahedra, edges with five equivalent Os(1)Er2Ga10 cuboctahedra, and faces with four equivalent Os(2)Er4Ga8 cuboctahedra. Both Os(1)-Ga(2) bond lengths are 2.61 Å. There are four shorter (2.65 Å) and four longer (2.68 Å) Os(1)-Ga(1,1) bond lengths. In the second Os site, Os(2) is bonded to four equivalent Er(1) and eight Ga(1,1) atoms to form distorted OsEr4Ga8 cuboctahedra that share corners with four equivalent Os(2)Er4Ga8 cuboctahedra and faces with eight equivalent Os(1)Er2Ga10 cuboctahedra. All Os(2)-Ga(1,1) bond lengths are 2.66 Å. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 10-coordinate geometry to two equivalent Er(1), one Os(2), two equivalent Os(1), one Ga(2), and four equivalent Ga(1) atoms. The Ga(1)-Ga(2) bond length is 2.64 Å. There are a spread of Ga(1)-Ga(1) bond distances ranging from 2.63-2.89 Å. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to two equivalent Er(1); two equivalent Os(1); one Ga(2); and four Ga(1,1) atoms. The Ga(2)-Ga(2) bond length is 2.74 Å. Both Ga(2)-Ga(1) bond lengths are 2.64 Å. In the third Ga site, Ga(1) is bonded in a 10-coordinate geometry to two equivalent Er(1); one Os(2); two equivalent Os(1); one Ga(2); and four Ga(1,1) atoms. There are a spread of Ga(1)-Ga(1,1) bond distances ranging from 2.63-2.89 Å.