Sm3Y5O12 is Spinel-like structured and crystallizes in the orthorhombic I2_12_12_1 space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form SmO6 octahedra that share  a cornercorner with one Sm(2)O6 octahedra,  a cornercorner with one Y(1)O6 octahedra,  a cornercorner with one Y(2)O6 octahedra,  a cornercorner with one Y(3)O6 octahedra,  a cornercorner with one Y(4)O6 octahedra,  a cornercorner with one Y(5)O6 octahedra,  an edgeedge with one Sm(2)O6 octahedra,  an edgeedge with one Y(1)O6 octahedra,  an edgeedge with one Y(2)O6 octahedra,  an edgeedge with one Y(3)O6 octahedra,  an edgeedge with one Y(4)O6 octahedra, and  an edgeedge with one Y(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-58°. In the second Sm site, Sm(2) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms to form distorted SmO6 octahedra that share corners with two equivalent Sm(1)O6 octahedra, corners with two equivalent Y(2)O6 octahedra, corners with two equivalent Y(3)O6 octahedra, edges with two equivalent Sm(1)O6 octahedra, edges with two equivalent Y(4)O6 octahedra, and edges with two equivalent Y(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-58°. There are five inequivalent Y sites. In the first Y site, Y(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form distorted YO6 octahedra that share corners with two equivalent Sm(1)O6 octahedra, corners with two equivalent Y(4)O6 octahedra, corners with two equivalent Y(5)O6 octahedra, edges with two equivalent Sm(1)O6 octahedra, edges with two equivalent Y(2)O6 octahedra, and edges with two equivalent Y(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 53-58°. In the second Y site, Y(2) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form distorted YO6 octahedra that share corners with two equivalent Sm(1)O6 octahedra, corners with two equivalent Sm(2)O6 octahedra, corners with two equivalent Y(3)O6 octahedra, edges with two equivalent Sm(1)O6 octahedra, edges with two equivalent Y(1)O6 octahedra, and edges with two equivalent Y(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 53-57°. In the third Y site, Y(3) is bonded to two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms to form distorted YO6 octahedra that share corners with two equivalent Sm(1)O6 octahedra, corners with two equivalent Sm(2)O6 octahedra, corners with two equivalent Y(2)O6 octahedra, edges with two equivalent Sm(1)O6 octahedra, edges with two equivalent Y(1)O6 octahedra, and edges with two equivalent Y(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 53-55°. In the fourth Y site, Y(4) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form distorted YO6 octahedra that share corners with two equivalent Sm(1)O6 octahedra, corners with two equivalent Y(1)O6 octahedra, corners with two equivalent Y(5)O6 octahedra, edges with two equivalent Sm(1)O6 octahedra, edges with two equivalent Sm(2)O6 octahedra, and edges with two equivalent Y(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 53-58°. In the fifth Y site, Y(5) is bonded to two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms to form distorted YO6 octahedra that share corners with two equivalent Sm(1)O6 octahedra, corners with two equivalent Y(1)O6 octahedra, corners with two equivalent Y(4)O6 octahedra, edges with two equivalent Sm(1)O6 octahedra, edges with two equivalent Sm(2)O6 octahedra, and edges with two equivalent Y(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 53-58°. There are six inequivalent O sites. In the first O site, O(1) is bonded to one Sm(1), one Y(1), one Y(2), and one Y(4) atom to form distorted OSmY3 trigonal pyramids that share  a cornercorner with one O(4)Sm2Y2 tetrahedra,  a cornercorner with one O(6)Sm2Y2 trigonal pyramid,  a cornercorner with one O(3)SmY3 trigonal pyramid, corners with three equivalent O(2)Sm2Y2 trigonal pyramids, corners with three equivalent O(1)SmY3 trigonal pyramids, corners with three equivalent O(5)SmY3 trigonal pyramids, edges with two equivalent O(4)Sm2Y2 tetrahedra, and edges with two equivalent O(3)SmY3 trigonal pyramids. In the second O site, O(2) is bonded to one Sm(1), one Sm(2), one Y(4), and one Y(5) atom to form OSm2Y2 trigonal pyramids that share  a cornercorner with one O(4)Sm2Y2 tetrahedra,  a cornercorner with one O(6)Sm2Y2 trigonal pyramid,  a cornercorner with one O(3)SmY3 trigonal pyramid, corners with three equivalent O(2)Sm2Y2 trigonal pyramids, corners with three equivalent O(1)SmY3 trigonal pyramids, corners with three equivalent O(5)SmY3 trigonal pyramids, edges with two equivalent O(4)Sm2Y2 tetrahedra, and edges with two equivalent O(6)Sm2Y2 trigonal pyramids. In the third O site, O(3) is bonded to one Sm(1), one Y(1), one Y(2), and one Y(3) atom to form OSmY3 trigonal pyramids that share corners with three equivalent O(4)Sm2Y2 tetrahedra,  a cornercorner with one O(2)Sm2Y2 trigonal pyramid,  a cornercorner with one O(1)SmY3 trigonal pyramid,  a cornercorner with one O(5)SmY3 trigonal pyramid, corners with three equivalent O(6)Sm2Y2 trigonal pyramids, corners with three equivalent O(3)SmY3 trigonal pyramids, edges with two equivalent O(1)SmY3 trigonal pyramids, and edges with two equivalent O(5)SmY3 trigonal pyramids. In the fourth O site, O(4) is bonded to one Sm(1), one Sm(2), one Y(2), and one Y(4) atom to form OSm2Y2 tetrahedra that share corners with three equivalent O(4)Sm2Y2 tetrahedra,  a cornercorner with one O(2)Sm2Y2 trigonal pyramid,  a cornercorner with one O(1)SmY3 trigonal pyramid,  a cornercorner with one O(5)SmY3 trigonal pyramid, corners with three equivalent O(6)Sm2Y2 trigonal pyramids, corners with three equivalent O(3)SmY3 trigonal pyramids, edges with two equivalent O(2)Sm2Y2 trigonal pyramids, and edges with two equivalent O(1)SmY3 trigonal pyramids. In the fifth O site, O(5) is bonded to one Sm(1), one Y(1), one Y(3), and one Y(5) atom to form OSmY3 trigonal pyramids that share  a cornercorner with one O(4)Sm2Y2 tetrahedra,  a cornercorner with one O(6)Sm2Y2 trigonal pyramid,  a cornercorner with one O(3)SmY3 trigonal pyramid, corners with three equivalent O(2)Sm2Y2 trigonal pyramids, corners with three equivalent O(1)SmY3 trigonal pyramids, corners with three equivalent O(5)SmY3 trigonal pyramids, edges with two equivalent O(6)Sm2Y2 trigonal pyramids, and edges with two equivalent O(3)SmY3 trigonal pyramids. In the sixth O site, O(6) is bonded to one Sm(1), one Sm(2), one Y(3), and one Y(5) atom to form OSm2Y2 trigonal pyramids that share corners with three equivalent O(4)Sm2Y2 tetrahedra,  a cornercorner with one O(2)Sm2Y2 trigonal pyramid,  a cornercorner with one O(1)SmY3 trigonal pyramid,  a cornercorner with one O(5)SmY3 trigonal pyramid, corners with three equivalent O(6)Sm2Y2 trigonal pyramids, corners with three equivalent O(3)SmY3 trigonal pyramids, edges with two equivalent O(2)Sm2Y2 trigonal pyramids, and edges with two equivalent O(5)SmY3 trigonal pyramids.
Sm3Y5O12 is Spinel-like structured and crystallizes in the orthorhombic I2_12_12_1 space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form SmO6 octahedra that share  a cornercorner with one Sm(2)O6 octahedra,  a cornercorner with one Y(1)O6 octahedra,  a cornercorner with one Y(2)O6 octahedra,  a cornercorner with one Y(3)O6 octahedra,  a cornercorner with one Y(4)O6 octahedra,  a cornercorner with one Y(5)O6 octahedra,  an edgeedge with one Sm(2)O6 octahedra,  an edgeedge with one Y(1)O6 octahedra,  an edgeedge with one Y(2)O6 octahedra,  an edgeedge with one Y(3)O6 octahedra,  an edgeedge with one Y(4)O6 octahedra, and  an edgeedge with one Y(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-58°. The Sm(1)-O(1) bond length is 2.34 Å. The Sm(1)-O(2) bond length is 2.35 Å. The Sm(1)-O(3) bond length is 2.35 Å. The Sm(1)-O(4) bond length is 2.33 Å. The Sm(1)-O(5) bond length is 2.34 Å. The Sm(1)-O(6) bond length is 2.34 Å. In the second Sm site, Sm(2) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms to form distorted SmO6 octahedra that share corners with two equivalent Sm(1)O6 octahedra, corners with two equivalent Y(2)O6 octahedra, corners with two equivalent Y(3)O6 octahedra, edges with two equivalent Sm(1)O6 octahedra, edges with two equivalent Y(4)O6 octahedra, and edges with two equivalent Y(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-58°. Both Sm(2)-O(2) bond lengths are 2.40 Å. Both Sm(2)-O(4) bond lengths are 2.30 Å. Both Sm(2)-O(6) bond lengths are 2.33 Å. There are five inequivalent Y sites. In the first Y site, Y(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form distorted YO6 octahedra that share corners with two equivalent Sm(1)O6 octahedra, corners with two equivalent Y(4)O6 octahedra, corners with two equivalent Y(5)O6 octahedra, edges with two equivalent Sm(1)O6 octahedra, edges with two equivalent Y(2)O6 octahedra, and edges with two equivalent Y(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 53-58°. Both Y(1)-O(1) bond lengths are 2.27 Å. Both Y(1)-O(3) bond lengths are 2.36 Å. Both Y(1)-O(5) bond lengths are 2.25 Å. In the second Y site, Y(2) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form distorted YO6 octahedra that share corners with two equivalent Sm(1)O6 octahedra, corners with two equivalent Sm(2)O6 octahedra, corners with two equivalent Y(3)O6 octahedra, edges with two equivalent Sm(1)O6 octahedra, edges with two equivalent Y(1)O6 octahedra, and edges with two equivalent Y(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 53-57°. Both Y(2)-O(1) bond lengths are 2.37 Å. Both Y(2)-O(3) bond lengths are 2.26 Å. Both Y(2)-O(4) bond lengths are 2.25 Å. In the third Y site, Y(3) is bonded to two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms to form distorted YO6 octahedra that share corners with two equivalent Sm(1)O6 octahedra, corners with two equivalent Sm(2)O6 octahedra, corners with two equivalent Y(2)O6 octahedra, edges with two equivalent Sm(1)O6 octahedra, edges with two equivalent Y(1)O6 octahedra, and edges with two equivalent Y(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 53-55°. Both Y(3)-O(3) bond lengths are 2.28 Å. Both Y(3)-O(5) bond lengths are 2.36 Å. Both Y(3)-O(6) bond lengths are 2.25 Å. In the fourth Y site, Y(4) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form distorted YO6 octahedra that share corners with two equivalent Sm(1)O6 octahedra, corners with two equivalent Y(1)O6 octahedra, corners with two equivalent Y(5)O6 octahedra, edges with two equivalent Sm(1)O6 octahedra, edges with two equivalent Sm(2)O6 octahedra, and edges with two equivalent Y(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 53-58°. Both Y(4)-O(1) bond lengths are 2.24 Å. Both Y(4)-O(2) bond lengths are 2.28 Å. Both Y(4)-O(4) bond lengths are 2.36 Å. In the fifth Y site, Y(5) is bonded to two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms to form distorted YO6 octahedra that share corners with two equivalent Sm(1)O6 octahedra, corners with two equivalent Y(1)O6 octahedra, corners with two equivalent Y(4)O6 octahedra, edges with two equivalent Sm(1)O6 octahedra, edges with two equivalent Sm(2)O6 octahedra, and edges with two equivalent Y(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 53-58°. Both Y(5)-O(2) bond lengths are 2.25 Å. Both Y(5)-O(5) bond lengths are 2.28 Å. Both Y(5)-O(6) bond lengths are 2.35 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded to one Sm(1), one Y(1), one Y(2), and one Y(4) atom to form distorted OSmY3 trigonal pyramids that share  a cornercorner with one O(4)Sm2Y2 tetrahedra,  a cornercorner with one O(6)Sm2Y2 trigonal pyramid,  a cornercorner with one O(3)SmY3 trigonal pyramid, corners with three equivalent O(2)Sm2Y2 trigonal pyramids, corners with three equivalent O(1)SmY3 trigonal pyramids, corners with three equivalent O(5)SmY3 trigonal pyramids, edges with two equivalent O(4)Sm2Y2 tetrahedra, and edges with two equivalent O(3)SmY3 trigonal pyramids. In the second O site, O(2) is bonded to one Sm(1), one Sm(2), one Y(4), and one Y(5) atom to form OSm2Y2 trigonal pyramids that share  a cornercorner with one O(4)Sm2Y2 tetrahedra,  a cornercorner with one O(6)Sm2Y2 trigonal pyramid,  a cornercorner with one O(3)SmY3 trigonal pyramid, corners with three equivalent O(2)Sm2Y2 trigonal pyramids, corners with three equivalent O(1)SmY3 trigonal pyramids, corners with three equivalent O(5)SmY3 trigonal pyramids, edges with two equivalent O(4)Sm2Y2 tetrahedra, and edges with two equivalent O(6)Sm2Y2 trigonal pyramids. In the third O site, O(3) is bonded to one Sm(1), one Y(1), one Y(2), and one Y(3) atom to form OSmY3 trigonal pyramids that share corners with three equivalent O(4)Sm2Y2 tetrahedra,  a cornercorner with one O(2)Sm2Y2 trigonal pyramid,  a cornercorner with one O(1)SmY3 trigonal pyramid,  a cornercorner with one O(5)SmY3 trigonal pyramid, corners with three equivalent O(6)Sm2Y2 trigonal pyramids, corners with three equivalent O(3)SmY3 trigonal pyramids, edges with two equivalent O(1)SmY3 trigonal pyramids, and edges with two equivalent O(5)SmY3 trigonal pyramids. In the fourth O site, O(4) is bonded to one Sm(1), one Sm(2), one Y(2), and one Y(4) atom to form OSm2Y2 tetrahedra that share corners with three equivalent O(4)Sm2Y2 tetrahedra,  a cornercorner with one O(2)Sm2Y2 trigonal pyramid,  a cornercorner with one O(1)SmY3 trigonal pyramid,  a cornercorner with one O(5)SmY3 trigonal pyramid, corners with three equivalent O(6)Sm2Y2 trigonal pyramids, corners with three equivalent O(3)SmY3 trigonal pyramids, edges with two equivalent O(2)Sm2Y2 trigonal pyramids, and edges with two equivalent O(1)SmY3 trigonal pyramids. In the fifth O site, O(5) is bonded to one Sm(1), one Y(1), one Y(3), and one Y(5) atom to form OSmY3 trigonal pyramids that share  a cornercorner with one O(4)Sm2Y2 tetrahedra,  a cornercorner with one O(6)Sm2Y2 trigonal pyramid,  a cornercorner with one O(3)SmY3 trigonal pyramid, corners with three equivalent O(2)Sm2Y2 trigonal pyramids, corners with three equivalent O(1)SmY3 trigonal pyramids, corners with three equivalent O(5)SmY3 trigonal pyramids, edges with two equivalent O(6)Sm2Y2 trigonal pyramids, and edges with two equivalent O(3)SmY3 trigonal pyramids. In the sixth O site, O(6) is bonded to one Sm(1), one Sm(2), one Y(3), and one Y(5) atom to form OSm2Y2 trigonal pyramids that share corners with three equivalent O(4)Sm2Y2 tetrahedra,  a cornercorner with one O(2)Sm2Y2 trigonal pyramid,  a cornercorner with one O(1)SmY3 trigonal pyramid,  a cornercorner with one O(5)SmY3 trigonal pyramid, corners with three equivalent O(6)Sm2Y2 trigonal pyramids, corners with three equivalent O(3)SmY3 trigonal pyramids, edges with two equivalent O(2)Sm2Y2 trigonal pyramids, and edges with two equivalent O(5)SmY3 trigonal pyramids.