Ca4Al6WO16 crystallizes in the tetragonal I-4 space group. Ca(1) is bonded in a 7-coordinate geometry to one O(2), two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms. W(1) is bonded in a tetrahedral geometry to four equivalent O(4) atoms. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form corner-sharing AlO4 tetrahedra. In the second Al site, Al(2) is bonded to four equivalent O(1) atoms to form corner-sharing AlO4 tetrahedra. In the third Al site, Al(3) is bonded to four equivalent O(2) atoms to form corner-sharing AlO4 tetrahedra. There are four inequivalent O sites. In the first O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Ca(1) and one W(1) atom. In the second O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Al(1), and one Al(2) atom. In the third O site, O(2) is bonded in a distorted trigonal planar geometry to one Ca(1), one Al(1), and one Al(3) atom. In the fourth O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Ca(1) and two equivalent Al(1) atoms.
Ca4Al6WO16 crystallizes in the tetragonal I-4 space group. Ca(1) is bonded in a 7-coordinate geometry to one O(2), two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms. The Ca(1)-O(2) bond length is 2.37 Å. There is one shorter (2.34 Å) and one longer (2.63 Å) Ca(1)-O(1) bond length. There is one shorter (2.33 Å) and one longer (3.08 Å) Ca(1)-O(3) bond length. There is one shorter (2.46 Å) and one longer (3.01 Å) Ca(1)-O(4) bond length. W(1) is bonded in a tetrahedral geometry to four equivalent O(4) atoms. All W(1)-O(4) bond lengths are 1.82 Å. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form corner-sharing AlO4 tetrahedra. The Al(1)-O(1) bond length is 1.76 Å. The Al(1)-O(2) bond length is 1.77 Å. There is one shorter (1.76 Å) and one longer (1.77 Å) Al(1)-O(3) bond length. In the second Al site, Al(2) is bonded to four equivalent O(1) atoms to form corner-sharing AlO4 tetrahedra. All Al(2)-O(1) bond lengths are 1.75 Å. In the third Al site, Al(3) is bonded to four equivalent O(2) atoms to form corner-sharing AlO4 tetrahedra. All Al(3)-O(2) bond lengths are 1.78 Å. There are four inequivalent O sites. In the first O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Ca(1) and one W(1) atom. In the second O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Al(1), and one Al(2) atom. In the third O site, O(2) is bonded in a distorted trigonal planar geometry to one Ca(1), one Al(1), and one Al(3) atom. In the fourth O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Ca(1) and two equivalent Al(1) atoms.