Ca2AlSnO5 is Aluminum carbonitride-derived structured and crystallizes in the triclinic P1 space group. There are four inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 5-coordinate geometry to one O(10), one O(2), one O(3), one O(5), and one O(8) atom. In the second Ca site, Ca(2) is bonded to one O(2), one O(4), one O(6), one O(7), and one O(9) atom to form distorted CaO5 trigonal bipyramids that share  a cornercorner with one Sn(1)O6 octahedra,  a cornercorner with one Sn(2)O6 octahedra, corners with two equivalent Al(1)O4 tetrahedra, corners with two equivalent Al(2)O4 tetrahedra,  an edgeedge with one Sn(1)O6 octahedra, and  an edgeedge with one Sn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 64-83°. In the third Ca site, Ca(3) is bonded in a 5-coordinate geometry to one O(1), one O(10), one O(4), one O(6), and one O(8) atom. In the fourth Ca site, Ca(4) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(5), one O(7), and one O(9) atom. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form AlO4 tetrahedra that share  a cornercorner with one Sn(1)O6 octahedra,  a cornercorner with one Sn(2)O6 octahedra, corners with two equivalent Al(2)O4 tetrahedra, and corners with two equivalent Ca(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 46-57°. In the second Al site, Al(2) is bonded to one O(1), one O(2), one O(3), and one O(6) atom to form AlO4 tetrahedra that share  a cornercorner with one Sn(1)O6 octahedra,  a cornercorner with one Sn(2)O6 octahedra, corners with two equivalent Al(1)O4 tetrahedra, and corners with two equivalent Ca(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 41-59°. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(10), one O(3), one O(4), one O(7), one O(8), and one O(9) atom to form SnO6 octahedra that share corners with four equivalent Sn(2)O6 octahedra,  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Ca(2)O5 trigonal bipyramid, and  an edgeedge with one Ca(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 32-43°. In the second Sn site, Sn(2) is bonded to one O(10), one O(5), one O(6), one O(7), one O(8), and one O(9) atom to form SnO6 octahedra that share corners with four equivalent Sn(1)O6 octahedra,  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Ca(2)O5 trigonal bipyramid, and  an edgeedge with one Ca(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 32-43°. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Ca(3), one Ca(4), one Al(1), and one Al(2) atom to form distorted OCa2Al2 trigonal pyramids that share  a cornercorner with one O(8)Ca2Sn2 tetrahedra, corners with two equivalent O(2)Ca2Al2 tetrahedra,  a cornercorner with one O(10)Ca2Sn2 trigonal pyramid, and  a cornercorner with one O(7)Ca2Sn2 trigonal pyramid. In the second O site, O(2) is bonded to one Ca(1), one Ca(2), one Al(1), and one Al(2) atom to form distorted OCa2Al2 tetrahedra that share  a cornercorner with one O(8)Ca2Sn2 tetrahedra,  a cornercorner with one O(10)Ca2Sn2 trigonal pyramid,  a cornercorner with one O(7)Ca2Sn2 trigonal pyramid, and corners with two equivalent O(1)Ca2Al2 trigonal pyramids. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Ca(4), one Al(2), and one Sn(1) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Ca(2), one Ca(3), one Al(1), and one Sn(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(4), one Al(1), and one Sn(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ca(2), one Ca(3), one Al(2), and one Sn(2) atom. In the seventh O site, O(7) is bonded to one Ca(2), one Ca(4), one Sn(1), and one Sn(2) atom to form OCa2Sn2 trigonal pyramids that share  a cornercorner with one O(2)Ca2Al2 tetrahedra, corners with two equivalent O(8)Ca2Sn2 tetrahedra,  a cornercorner with one O(1)Ca2Al2 trigonal pyramid, and corners with two equivalent O(10)Ca2Sn2 trigonal pyramids. In the eighth O site, O(8) is bonded to one Ca(1), one Ca(3), one Sn(1), and one Sn(2) atom to form OCa2Sn2 tetrahedra that share  a cornercorner with one O(2)Ca2Al2 tetrahedra,  a cornercorner with one O(1)Ca2Al2 trigonal pyramid, corners with two equivalent O(10)Ca2Sn2 trigonal pyramids, corners with two equivalent O(7)Ca2Sn2 trigonal pyramids, and  an edgeedge with one O(10)Ca2Sn2 trigonal pyramid. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Ca(2), one Ca(4), one Sn(1), and one Sn(2) atom. In the tenth O site, O(10) is bonded to one Ca(1), one Ca(3), one Sn(1), and one Sn(2) atom to form distorted OCa2Sn2 trigonal pyramids that share  a cornercorner with one O(2)Ca2Al2 tetrahedra, corners with two equivalent O(8)Ca2Sn2 tetrahedra,  a cornercorner with one O(1)Ca2Al2 trigonal pyramid, corners with two equivalent O(7)Ca2Sn2 trigonal pyramids, and  an edgeedge with one O(8)Ca2Sn2 tetrahedra.
Ca2AlSnO5 is Aluminum carbonitride-derived structured and crystallizes in the triclinic P1 space group. There are four inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 5-coordinate geometry to one O(10), one O(2), one O(3), one O(5), and one O(8) atom. The Ca(1)-O(10) bond length is 2.32 Å. The Ca(1)-O(2) bond length is 2.49 Å. The Ca(1)-O(3) bond length is 2.55 Å. The Ca(1)-O(5) bond length is 2.35 Å. The Ca(1)-O(8) bond length is 2.26 Å. In the second Ca site, Ca(2) is bonded to one O(2), one O(4), one O(6), one O(7), and one O(9) atom to form distorted CaO5 trigonal bipyramids that share  a cornercorner with one Sn(1)O6 octahedra,  a cornercorner with one Sn(2)O6 octahedra, corners with two equivalent Al(1)O4 tetrahedra, corners with two equivalent Al(2)O4 tetrahedra,  an edgeedge with one Sn(1)O6 octahedra, and  an edgeedge with one Sn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 64-83°. The Ca(2)-O(2) bond length is 2.59 Å. The Ca(2)-O(4) bond length is 2.42 Å. The Ca(2)-O(6) bond length is 2.36 Å. The Ca(2)-O(7) bond length is 2.32 Å. The Ca(2)-O(9) bond length is 2.35 Å. In the third Ca site, Ca(3) is bonded in a 5-coordinate geometry to one O(1), one O(10), one O(4), one O(6), and one O(8) atom. The Ca(3)-O(1) bond length is 2.58 Å. The Ca(3)-O(10) bond length is 2.28 Å. The Ca(3)-O(4) bond length is 2.59 Å. The Ca(3)-O(6) bond length is 2.35 Å. The Ca(3)-O(8) bond length is 2.30 Å. In the fourth Ca site, Ca(4) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(5), one O(7), and one O(9) atom. The Ca(4)-O(1) bond length is 2.52 Å. The Ca(4)-O(3) bond length is 2.38 Å. The Ca(4)-O(5) bond length is 2.46 Å. The Ca(4)-O(7) bond length is 2.39 Å. The Ca(4)-O(9) bond length is 2.30 Å. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form AlO4 tetrahedra that share  a cornercorner with one Sn(1)O6 octahedra,  a cornercorner with one Sn(2)O6 octahedra, corners with two equivalent Al(2)O4 tetrahedra, and corners with two equivalent Ca(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 46-57°. The Al(1)-O(1) bond length is 1.86 Å. The Al(1)-O(2) bond length is 1.85 Å. The Al(1)-O(4) bond length is 1.78 Å. The Al(1)-O(5) bond length is 1.76 Å. In the second Al site, Al(2) is bonded to one O(1), one O(2), one O(3), and one O(6) atom to form AlO4 tetrahedra that share  a cornercorner with one Sn(1)O6 octahedra,  a cornercorner with one Sn(2)O6 octahedra, corners with two equivalent Al(1)O4 tetrahedra, and corners with two equivalent Ca(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 41-59°. The Al(2)-O(1) bond length is 1.85 Å. The Al(2)-O(2) bond length is 1.87 Å. The Al(2)-O(3) bond length is 1.77 Å. The Al(2)-O(6) bond length is 1.76 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(10), one O(3), one O(4), one O(7), one O(8), and one O(9) atom to form SnO6 octahedra that share corners with four equivalent Sn(2)O6 octahedra,  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Ca(2)O5 trigonal bipyramid, and  an edgeedge with one Ca(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 32-43°. The Sn(1)-O(10) bond length is 2.06 Å. The Sn(1)-O(3) bond length is 2.19 Å. The Sn(1)-O(4) bond length is 2.19 Å. The Sn(1)-O(7) bond length is 2.07 Å. The Sn(1)-O(8) bond length is 2.03 Å. The Sn(1)-O(9) bond length is 2.07 Å. In the second Sn site, Sn(2) is bonded to one O(10), one O(5), one O(6), one O(7), one O(8), and one O(9) atom to form SnO6 octahedra that share corners with four equivalent Sn(1)O6 octahedra,  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Ca(2)O5 trigonal bipyramid, and  an edgeedge with one Ca(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 32-43°. The Sn(2)-O(10) bond length is 2.36 Å. The Sn(2)-O(5) bond length is 2.52 Å. The Sn(2)-O(6) bond length is 2.60 Å. The Sn(2)-O(7) bond length is 2.28 Å. The Sn(2)-O(8) bond length is 2.33 Å. The Sn(2)-O(9) bond length is 2.41 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Ca(3), one Ca(4), one Al(1), and one Al(2) atom to form distorted OCa2Al2 trigonal pyramids that share  a cornercorner with one O(8)Ca2Sn2 tetrahedra, corners with two equivalent O(2)Ca2Al2 tetrahedra,  a cornercorner with one O(10)Ca2Sn2 trigonal pyramid, and  a cornercorner with one O(7)Ca2Sn2 trigonal pyramid. In the second O site, O(2) is bonded to one Ca(1), one Ca(2), one Al(1), and one Al(2) atom to form distorted OCa2Al2 tetrahedra that share  a cornercorner with one O(8)Ca2Sn2 tetrahedra,  a cornercorner with one O(10)Ca2Sn2 trigonal pyramid,  a cornercorner with one O(7)Ca2Sn2 trigonal pyramid, and corners with two equivalent O(1)Ca2Al2 trigonal pyramids. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Ca(4), one Al(2), and one Sn(1) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Ca(2), one Ca(3), one Al(1), and one Sn(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(4), one Al(1), and one Sn(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ca(2), one Ca(3), one Al(2), and one Sn(2) atom. In the seventh O site, O(7) is bonded to one Ca(2), one Ca(4), one Sn(1), and one Sn(2) atom to form OCa2Sn2 trigonal pyramids that share  a cornercorner with one O(2)Ca2Al2 tetrahedra, corners with two equivalent O(8)Ca2Sn2 tetrahedra,  a cornercorner with one O(1)Ca2Al2 trigonal pyramid, and corners with two equivalent O(10)Ca2Sn2 trigonal pyramids. In the eighth O site, O(8) is bonded to one Ca(1), one Ca(3), one Sn(1), and one Sn(2) atom to form OCa2Sn2 tetrahedra that share  a cornercorner with one O(2)Ca2Al2 tetrahedra,  a cornercorner with one O(1)Ca2Al2 trigonal pyramid, corners with two equivalent O(10)Ca2Sn2 trigonal pyramids, corners with two equivalent O(7)Ca2Sn2 trigonal pyramids, and  an edgeedge with one O(10)Ca2Sn2 trigonal pyramid. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Ca(2), one Ca(4), one Sn(1), and one Sn(2) atom. In the tenth O site, O(10) is bonded to one Ca(1), one Ca(3), one Sn(1), and one Sn(2) atom to form distorted OCa2Sn2 trigonal pyramids that share  a cornercorner with one O(2)Ca2Al2 tetrahedra, corners with two equivalent O(8)Ca2Sn2 tetrahedra,  a cornercorner with one O(1)Ca2Al2 trigonal pyramid, corners with two equivalent O(7)Ca2Sn2 trigonal pyramids, and  an edgeedge with one O(8)Ca2Sn2 tetrahedra.