KNd3Te8 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 8-coordinate geometry to one Te(1), one Te(6), two equivalent Te(5), two equivalent Te(7), and two equivalent Te(8) atoms. There are three inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 8-coordinate geometry to one Te(1), one Te(2), one Te(5), one Te(7), two equivalent Te(3), and two equivalent Te(4) atoms. In the second Nd site, Nd(2) is bonded in a 9-coordinate geometry to one Te(4), one Te(7), one Te(8), two equivalent Te(2), two equivalent Te(3), and two equivalent Te(6) atoms. In the third Nd site, Nd(3) is bonded in a 8-coordinate geometry to one Te(1), one Te(3), one Te(5), one Te(8), two equivalent Te(2), and two equivalent Te(4) atoms. There are eight inequivalent Te sites. In the first Te site, Te(1) is bonded in a 7-coordinate geometry to one K(1), one Nd(1), one Nd(3), one Te(7), one Te(8), and two equivalent Te(5) atoms. In the second Te site, Te(2) is bonded to one Nd(1), two equivalent Nd(2), and two equivalent Nd(3) atoms to form a mixture of distorted corner and edge-sharing TeNd5 trigonal bipyramids. In the third Te site, Te(3) is bonded to one Nd(3), two equivalent Nd(1), and two equivalent Nd(2) atoms to form a mixture of distorted corner and edge-sharing TeNd5 trigonal bipyramids. In the fourth Te site, Te(4) is bonded to one Nd(2), two equivalent Nd(1), and two equivalent Nd(3) atoms to form a mixture of distorted corner and edge-sharing TeNd5 trigonal bipyramids. In the fifth Te site, Te(5) is bonded in a 6-coordinate geometry to two equivalent K(1), one Nd(1), one Nd(3), and two equivalent Te(1) atoms. In the sixth Te site, Te(6) is bonded in a 5-coordinate geometry to one K(1), two equivalent Nd(2), two equivalent Te(7), and two equivalent Te(8) atoms. In the seventh Te site, Te(7) is bonded in a 7-coordinate geometry to two equivalent K(1), one Nd(1), one Nd(2), one Te(1), and two equivalent Te(6) atoms. In the eighth Te site, Te(8) is bonded in a 7-coordinate geometry to two equivalent K(1), one Nd(2), one Nd(3), one Te(1), and two equivalent Te(6) atoms.
KNd3Te8 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 8-coordinate geometry to one Te(1), one Te(6), two equivalent Te(5), two equivalent Te(7), and two equivalent Te(8) atoms. The K(1)-Te(1) bond length is 3.78 Å. The K(1)-Te(6) bond length is 3.64 Å. There is one shorter (3.60 Å) and one longer (3.63 Å) K(1)-Te(5) bond length. There is one shorter (3.61 Å) and one longer (3.73 Å) K(1)-Te(7) bond length. There is one shorter (3.64 Å) and one longer (3.67 Å) K(1)-Te(8) bond length. There are three inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 8-coordinate geometry to one Te(1), one Te(2), one Te(5), one Te(7), two equivalent Te(3), and two equivalent Te(4) atoms. The Nd(1)-Te(1) bond length is 3.34 Å. The Nd(1)-Te(2) bond length is 3.24 Å. The Nd(1)-Te(5) bond length is 3.30 Å. The Nd(1)-Te(7) bond length is 3.33 Å. There is one shorter (3.28 Å) and one longer (3.30 Å) Nd(1)-Te(3) bond length. There is one shorter (3.25 Å) and one longer (3.26 Å) Nd(1)-Te(4) bond length. In the second Nd site, Nd(2) is bonded in a 9-coordinate geometry to one Te(4), one Te(7), one Te(8), two equivalent Te(2), two equivalent Te(3), and two equivalent Te(6) atoms. The Nd(2)-Te(4) bond length is 3.31 Å. The Nd(2)-Te(7) bond length is 3.32 Å. The Nd(2)-Te(8) bond length is 3.33 Å. There is one shorter (3.24 Å) and one longer (3.26 Å) Nd(2)-Te(2) bond length. There is one shorter (3.28 Å) and one longer (3.30 Å) Nd(2)-Te(3) bond length. Both Nd(2)-Te(6) bond lengths are 3.45 Å. In the third Nd site, Nd(3) is bonded in a 8-coordinate geometry to one Te(1), one Te(3), one Te(5), one Te(8), two equivalent Te(2), and two equivalent Te(4) atoms. The Nd(3)-Te(1) bond length is 3.34 Å. The Nd(3)-Te(3) bond length is 3.26 Å. The Nd(3)-Te(5) bond length is 3.28 Å. The Nd(3)-Te(8) bond length is 3.33 Å. There is one shorter (3.23 Å) and one longer (3.30 Å) Nd(3)-Te(2) bond length. There is one shorter (3.24 Å) and one longer (3.27 Å) Nd(3)-Te(4) bond length. There are eight inequivalent Te sites. In the first Te site, Te(1) is bonded in a 7-coordinate geometry to one K(1), one Nd(1), one Nd(3), one Te(7), one Te(8), and two equivalent Te(5) atoms. The Te(1)-Te(7) bond length is 3.27 Å. The Te(1)-Te(8) bond length is 3.29 Å. There is one shorter (3.00 Å) and one longer (3.01 Å) Te(1)-Te(5) bond length. In the second Te site, Te(2) is bonded to one Nd(1), two equivalent Nd(2), and two equivalent Nd(3) atoms to form a mixture of distorted corner and edge-sharing TeNd5 trigonal bipyramids. In the third Te site, Te(3) is bonded to one Nd(3), two equivalent Nd(1), and two equivalent Nd(2) atoms to form a mixture of distorted corner and edge-sharing TeNd5 trigonal bipyramids. In the fourth Te site, Te(4) is bonded to one Nd(2), two equivalent Nd(1), and two equivalent Nd(3) atoms to form a mixture of distorted corner and edge-sharing TeNd5 trigonal bipyramids. In the fifth Te site, Te(5) is bonded in a 6-coordinate geometry to two equivalent K(1), one Nd(1), one Nd(3), and two equivalent Te(1) atoms. In the sixth Te site, Te(6) is bonded in a 5-coordinate geometry to one K(1), two equivalent Nd(2), two equivalent Te(7), and two equivalent Te(8) atoms. There is one shorter (2.86 Å) and one longer (3.47 Å) Te(6)-Te(7) bond length. There is one shorter (2.86 Å) and one longer (3.45 Å) Te(6)-Te(8) bond length. In the seventh Te site, Te(7) is bonded in a 7-coordinate geometry to two equivalent K(1), one Nd(1), one Nd(2), one Te(1), and two equivalent Te(6) atoms. In the eighth Te site, Te(8) is bonded in a 7-coordinate geometry to two equivalent K(1), one Nd(2), one Nd(3), one Te(1), and two equivalent Te(6) atoms.