Y4Fe13Si2(SbO14)2 is Aluminum carbonitride-derived structured and crystallizes in the monoclinic C2/m space group. Y(1) is bonded to one O(1), one O(5), and three equivalent O(2) atoms to form distorted YO5 trigonal bipyramids that share  a cornercorner with one Sb(1)O6 octahedra, corners with two equivalent Fe(3)O6 octahedra,  a cornercorner with one Fe(2)O4 tetrahedra, corners with two equivalent Y(1)O5 trigonal bipyramids, corners with three equivalent Fe(1)O5 trigonal bipyramids,  an edgeedge with one Fe(1)O5 trigonal bipyramid, and edges with two equivalent Y(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 61-66°. There are five inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(2), one O(7), one O(8), and two equivalent O(1) atoms to form FeO5 trigonal bipyramids that share  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Fe(5)O6 octahedra,  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with three equivalent Fe(2)O4 tetrahedra, corners with three equivalent Y(1)O5 trigonal bipyramids,  an edgeedge with one Y(1)O5 trigonal bipyramid, and  an edgeedge with one Fe(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 55-66°. In the second Fe site, Fe(2) is bonded to one O(1), one O(3), one O(6), and one O(7) atom to form FeO4 tetrahedra that share  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one Fe(5)O6 octahedra,  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Fe(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra,  a cornercorner with one Y(1)O5 trigonal bipyramid, and corners with three equivalent Fe(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 51-70°. In the third Fe site, Fe(3) is bonded to two equivalent O(8) and four equivalent O(5) atoms to form distorted FeO6 octahedra that share corners with two equivalent Fe(1)O5 trigonal bipyramids, corners with four equivalent Y(1)O5 trigonal bipyramids,  an edgeedge with one Fe(5)O6 octahedra, edges with two equivalent Fe(3)O6 octahedra, and edges with three equivalent Sb(1)O6 octahedra. In the fourth Fe site, Fe(4) is bonded to two equivalent O(4) and four equivalent O(6) atoms to form FeO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with four equivalent Fe(2)O4 tetrahedra, edges with two equivalent Sb(1)O6 octahedra, and edges with four equivalent Fe(5)O6 octahedra. In the fifth Fe site, Fe(5) is bonded to two equivalent O(4), two equivalent O(6), and two equivalent O(8) atoms to form FeO6 octahedra that share corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Fe(1)O5 trigonal bipyramids,  an edgeedge with one Fe(3)O6 octahedra,  an edgeedge with one Fe(5)O6 octahedra, edges with two equivalent Fe(4)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. Si(1) is bonded to one O(3), one O(4), and two equivalent O(7) atoms to form SiO4 tetrahedra that share  a cornercorner with one Fe(4)O6 octahedra, corners with two equivalent Fe(5)O6 octahedra, corners with four equivalent Fe(2)O4 tetrahedra, and corners with two equivalent Fe(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 59-65°. Sb(1) is bonded to two equivalent O(5), two equivalent O(6), and two equivalent O(8) atoms to form SbO6 octahedra that share corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Y(1)O5 trigonal bipyramids, corners with two equivalent Fe(1)O5 trigonal bipyramids,  an edgeedge with one Fe(4)O6 octahedra, edges with two equivalent Fe(5)O6 octahedra, and edges with three equivalent Fe(3)O6 octahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Y(1), one Fe(2), and two equivalent Fe(1) atoms to form OYFe3 tetrahedra that share  a cornercorner with one O(6)Fe3Sb tetrahedra,  a cornercorner with one O(5)YFe2Sb tetrahedra, corners with three equivalent O(2)Y3Fe tetrahedra,  an edgeedge with one O(2)Y3Fe tetrahedra, and  an edgeedge with one O(1)YFe3 tetrahedra. In the second O site, O(2) is bonded to three equivalent Y(1) and one Fe(1) atom to form distorted OY3Fe tetrahedra that share corners with two equivalent O(2)Y3Fe tetrahedra, corners with three equivalent O(5)YFe2Sb tetrahedra, corners with three equivalent O(1)YFe3 tetrahedra,  an edgeedge with one O(1)YFe3 tetrahedra, and edges with two equivalent O(2)Y3Fe tetrahedra. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Fe(2) and one Si(1) atom. In the fourth O site, O(4) is bonded to one Fe(4), two equivalent Fe(5), and one Si(1) atom to form distorted OFe3Si tetrahedra that share  a cornercorner with one O(4)Fe3Si tetrahedra, corners with four equivalent O(6)Fe3Sb tetrahedra,  an edgeedge with one O(4)Fe3Si tetrahedra, and edges with two equivalent O(6)Fe3Sb tetrahedra. In the fifth O site, O(5) is bonded to one Y(1), two equivalent Fe(3), and one Sb(1) atom to form OYFe2Sb tetrahedra that share  a cornercorner with one O(1)YFe3 tetrahedra, corners with two equivalent O(6)Fe3Sb tetrahedra, corners with three equivalent O(2)Y3Fe tetrahedra, corners with three equivalent O(5)YFe2Sb tetrahedra, and edges with two equivalent O(5)YFe2Sb tetrahedra. In the sixth O site, O(6) is bonded to one Fe(2), one Fe(4), one Fe(5), and one Sb(1) atom to form OFe3Sb tetrahedra that share  a cornercorner with one O(1)YFe3 tetrahedra, corners with two equivalent O(4)Fe3Si tetrahedra, corners with two equivalent O(5)YFe2Sb tetrahedra, corners with three equivalent O(6)Fe3Sb tetrahedra,  an edgeedge with one O(6)Fe3Sb tetrahedra, and  an edgeedge with one O(4)Fe3Si tetrahedra. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(2), and one Si(1) atom. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one Fe(1), one Fe(3), one Fe(5), and one Sb(1) atom.
Y4Fe13Si2(SbO14)2 is Aluminum carbonitride-derived structured and crystallizes in the monoclinic C2/m space group. Y(1) is bonded to one O(1), one O(5), and three equivalent O(2) atoms to form distorted YO5 trigonal bipyramids that share  a cornercorner with one Sb(1)O6 octahedra, corners with two equivalent Fe(3)O6 octahedra,  a cornercorner with one Fe(2)O4 tetrahedra, corners with two equivalent Y(1)O5 trigonal bipyramids, corners with three equivalent Fe(1)O5 trigonal bipyramids,  an edgeedge with one Fe(1)O5 trigonal bipyramid, and edges with two equivalent Y(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 61-66°. The Y(1)-O(1) bond length is 2.09 Å. The Y(1)-O(5) bond length is 2.23 Å. There are a spread of Y(1)-O(2) bond distances ranging from 2.16-2.50 Å. There are five inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(2), one O(7), one O(8), and two equivalent O(1) atoms to form FeO5 trigonal bipyramids that share  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Fe(5)O6 octahedra,  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with three equivalent Fe(2)O4 tetrahedra, corners with three equivalent Y(1)O5 trigonal bipyramids,  an edgeedge with one Y(1)O5 trigonal bipyramid, and  an edgeedge with one Fe(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 55-66°. The Fe(1)-O(2) bond length is 2.07 Å. The Fe(1)-O(7) bond length is 2.04 Å. The Fe(1)-O(8) bond length is 2.18 Å. There is one shorter (2.05 Å) and one longer (2.24 Å) Fe(1)-O(1) bond length. In the second Fe site, Fe(2) is bonded to one O(1), one O(3), one O(6), and one O(7) atom to form FeO4 tetrahedra that share  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one Fe(5)O6 octahedra,  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Fe(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra,  a cornercorner with one Y(1)O5 trigonal bipyramid, and corners with three equivalent Fe(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 51-70°. The Fe(2)-O(1) bond length is 1.97 Å. The Fe(2)-O(3) bond length is 2.02 Å. The Fe(2)-O(6) bond length is 2.07 Å. The Fe(2)-O(7) bond length is 2.03 Å. In the third Fe site, Fe(3) is bonded to two equivalent O(8) and four equivalent O(5) atoms to form distorted FeO6 octahedra that share corners with two equivalent Fe(1)O5 trigonal bipyramids, corners with four equivalent Y(1)O5 trigonal bipyramids,  an edgeedge with one Fe(5)O6 octahedra, edges with two equivalent Fe(3)O6 octahedra, and edges with three equivalent Sb(1)O6 octahedra. Both Fe(3)-O(8) bond lengths are 2.35 Å. There are two shorter (2.14 Å) and two longer (2.45 Å) Fe(3)-O(5) bond lengths. In the fourth Fe site, Fe(4) is bonded to two equivalent O(4) and four equivalent O(6) atoms to form FeO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with four equivalent Fe(2)O4 tetrahedra, edges with two equivalent Sb(1)O6 octahedra, and edges with four equivalent Fe(5)O6 octahedra. Both Fe(4)-O(4) bond lengths are 2.28 Å. All Fe(4)-O(6) bond lengths are 2.27 Å. In the fifth Fe site, Fe(5) is bonded to two equivalent O(4), two equivalent O(6), and two equivalent O(8) atoms to form FeO6 octahedra that share corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Fe(1)O5 trigonal bipyramids,  an edgeedge with one Fe(3)O6 octahedra,  an edgeedge with one Fe(5)O6 octahedra, edges with two equivalent Fe(4)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. Both Fe(5)-O(4) bond lengths are 2.23 Å. Both Fe(5)-O(6) bond lengths are 2.18 Å. Both Fe(5)-O(8) bond lengths are 2.27 Å. Si(1) is bonded to one O(3), one O(4), and two equivalent O(7) atoms to form SiO4 tetrahedra that share  a cornercorner with one Fe(4)O6 octahedra, corners with two equivalent Fe(5)O6 octahedra, corners with four equivalent Fe(2)O4 tetrahedra, and corners with two equivalent Fe(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 59-65°. The Si(1)-O(3) bond length is 1.64 Å. The Si(1)-O(4) bond length is 1.64 Å. Both Si(1)-O(7) bond lengths are 1.66 Å. Sb(1) is bonded to two equivalent O(5), two equivalent O(6), and two equivalent O(8) atoms to form SbO6 octahedra that share corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Y(1)O5 trigonal bipyramids, corners with two equivalent Fe(1)O5 trigonal bipyramids,  an edgeedge with one Fe(4)O6 octahedra, edges with two equivalent Fe(5)O6 octahedra, and edges with three equivalent Fe(3)O6 octahedra. Both Sb(1)-O(5) bond lengths are 2.11 Å. Both Sb(1)-O(6) bond lengths are 2.04 Å. Both Sb(1)-O(8) bond lengths are 2.04 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Y(1), one Fe(2), and two equivalent Fe(1) atoms to form OYFe3 tetrahedra that share  a cornercorner with one O(6)Fe3Sb tetrahedra,  a cornercorner with one O(5)YFe2Sb tetrahedra, corners with three equivalent O(2)Y3Fe tetrahedra,  an edgeedge with one O(2)Y3Fe tetrahedra, and  an edgeedge with one O(1)YFe3 tetrahedra. In the second O site, O(2) is bonded to three equivalent Y(1) and one Fe(1) atom to form distorted OY3Fe tetrahedra that share corners with two equivalent O(2)Y3Fe tetrahedra, corners with three equivalent O(5)YFe2Sb tetrahedra, corners with three equivalent O(1)YFe3 tetrahedra,  an edgeedge with one O(1)YFe3 tetrahedra, and edges with two equivalent O(2)Y3Fe tetrahedra. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Fe(2) and one Si(1) atom. In the fourth O site, O(4) is bonded to one Fe(4), two equivalent Fe(5), and one Si(1) atom to form distorted OFe3Si tetrahedra that share  a cornercorner with one O(4)Fe3Si tetrahedra, corners with four equivalent O(6)Fe3Sb tetrahedra,  an edgeedge with one O(4)Fe3Si tetrahedra, and edges with two equivalent O(6)Fe3Sb tetrahedra. In the fifth O site, O(5) is bonded to one Y(1), two equivalent Fe(3), and one Sb(1) atom to form OYFe2Sb tetrahedra that share  a cornercorner with one O(1)YFe3 tetrahedra, corners with two equivalent O(6)Fe3Sb tetrahedra, corners with three equivalent O(2)Y3Fe tetrahedra, corners with three equivalent O(5)YFe2Sb tetrahedra, and edges with two equivalent O(5)YFe2Sb tetrahedra. In the sixth O site, O(6) is bonded to one Fe(2), one Fe(4), one Fe(5), and one Sb(1) atom to form OFe3Sb tetrahedra that share  a cornercorner with one O(1)YFe3 tetrahedra, corners with two equivalent O(4)Fe3Si tetrahedra, corners with two equivalent O(5)YFe2Sb tetrahedra, corners with three equivalent O(6)Fe3Sb tetrahedra,  an edgeedge with one O(6)Fe3Sb tetrahedra, and  an edgeedge with one O(4)Fe3Si tetrahedra. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(2), and one Si(1) atom. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one Fe(1), one Fe(3), one Fe(5), and one Sb(1) atom.