K6NbAs3O crystallizes in the cubic P2_13 space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a distorted single-bond geometry to four equivalent As(1) and one O(1) atom. In the second K site, K(2) is bonded in a 3-coordinate geometry to six equivalent As(1) atoms. In the third K site, K(3) is bonded in a trigonal pyramidal geometry to three equivalent As(1) and one O(1) atom. In the fourth K site, K(4) is bonded in a 3-coordinate geometry to three equivalent As(1) atoms. Nb(1) is bonded in a distorted single-bond geometry to three equivalent As(1) and one O(1) atom. As(1) is bonded in a 9-coordinate geometry to one K(3), one K(4), two equivalent K(2), four equivalent K(1), and one Nb(1) atom. O(1) is bonded in a 5-coordinate geometry to one K(3), three equivalent K(1), and one Nb(1) atom.
K6NbAs3O crystallizes in the cubic P2_13 space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a distorted single-bond geometry to four equivalent As(1) and one O(1) atom. There are a spread of K(1)-As(1) bond distances ranging from 3.34-3.65 Å. The K(1)-O(1) bond length is 2.71 Å. In the second K site, K(2) is bonded in a 3-coordinate geometry to six equivalent As(1) atoms. There are three shorter (3.80 Å) and three longer (3.89 Å) K(2)-As(1) bond lengths. In the third K site, K(3) is bonded in a trigonal pyramidal geometry to three equivalent As(1) and one O(1) atom. All K(3)-As(1) bond lengths are 3.21 Å. The K(3)-O(1) bond length is 2.94 Å. In the fourth K site, K(4) is bonded in a 3-coordinate geometry to three equivalent As(1) atoms. All K(4)-As(1) bond lengths are 3.46 Å. Nb(1) is bonded in a distorted single-bond geometry to three equivalent As(1) and one O(1) atom. All Nb(1)-As(1) bond lengths are 2.54 Å. The Nb(1)-O(1) bond length is 1.86 Å. As(1) is bonded in a 9-coordinate geometry to one K(3), one K(4), two equivalent K(2), four equivalent K(1), and one Nb(1) atom. O(1) is bonded in a 5-coordinate geometry to one K(3), three equivalent K(1), and one Nb(1) atom.