K2AlB5O14 crystallizes in the monoclinic P2_1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(13), one O(14), one O(4), one O(6), one O(7), and one O(8) atom. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(10), one O(12), one O(3), one O(5), one O(6), one O(8), and one O(9) atom. Al(1) is bonded in a tetrahedral geometry to one O(1), one O(3), one O(5), and one O(7) atom. There are five inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(10), one O(7), and one O(9) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(10), one O(11), and one O(3) atom. In the third B site, B(3) is bonded in a tetrahedral geometry to one O(11), one O(12), one O(13), and one O(9) atom. In the fourth B site, B(4) is bonded in a trigonal planar geometry to one O(13), one O(14), and one O(5) atom. In the fifth B site, B(5) is bonded in a trigonal planar geometry to one O(1), one O(12), and one O(14) atom. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one K(1), one Al(1), and one B(5) atom. In the second O site, O(2) is bonded in a single-bond geometry to one O(8) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one K(2), one Al(1), and one B(2) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one K(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one K(2), one Al(1), and one B(4) atom. In the sixth O site, O(6) is bonded in a water-like geometry to one K(1) and one K(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one K(1), one Al(1), and one B(1) atom. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one K(1), one K(2), and one O(2) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one K(2), one B(1), and one B(3) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one K(2), one B(1), and one B(2) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one K(1), one B(2), and one B(3) atom. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one K(2), one B(3), and one B(5) atom. In the thirteenth O site, O(13) is bonded in a bent 120 degrees geometry to one K(1), one B(3), and one B(4) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 120 degrees geometry to one K(1), one B(4), and one B(5) atom.
K2AlB5O14 crystallizes in the monoclinic P2_1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(13), one O(14), one O(4), one O(6), one O(7), and one O(8) atom. The K(1)-O(1) bond length is 2.95 Å. The K(1)-O(11) bond length is 2.77 Å. The K(1)-O(13) bond length is 3.03 Å. The K(1)-O(14) bond length is 2.90 Å. The K(1)-O(4) bond length is 2.95 Å. The K(1)-O(6) bond length is 3.11 Å. The K(1)-O(7) bond length is 2.90 Å. The K(1)-O(8) bond length is 3.21 Å. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(10), one O(12), one O(3), one O(5), one O(6), one O(8), and one O(9) atom. The K(2)-O(10) bond length is 2.87 Å. The K(2)-O(12) bond length is 2.76 Å. The K(2)-O(3) bond length is 2.87 Å. The K(2)-O(5) bond length is 3.08 Å. The K(2)-O(6) bond length is 3.09 Å. The K(2)-O(8) bond length is 3.29 Å. The K(2)-O(9) bond length is 2.93 Å. Al(1) is bonded in a tetrahedral geometry to one O(1), one O(3), one O(5), and one O(7) atom. The Al(1)-O(1) bond length is 1.76 Å. The Al(1)-O(3) bond length is 1.76 Å. The Al(1)-O(5) bond length is 1.77 Å. The Al(1)-O(7) bond length is 1.78 Å. There are five inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(10), one O(7), and one O(9) atom. The B(1)-O(10) bond length is 1.40 Å. The B(1)-O(7) bond length is 1.35 Å. The B(1)-O(9) bond length is 1.38 Å. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(10), one O(11), and one O(3) atom. The B(2)-O(10) bond length is 1.41 Å. The B(2)-O(11) bond length is 1.37 Å. The B(2)-O(3) bond length is 1.35 Å. In the third B site, B(3) is bonded in a tetrahedral geometry to one O(11), one O(12), one O(13), and one O(9) atom. The B(3)-O(11) bond length is 1.47 Å. The B(3)-O(12) bond length is 1.47 Å. The B(3)-O(13) bond length is 1.47 Å. The B(3)-O(9) bond length is 1.50 Å. In the fourth B site, B(4) is bonded in a trigonal planar geometry to one O(13), one O(14), and one O(5) atom. The B(4)-O(13) bond length is 1.37 Å. The B(4)-O(14) bond length is 1.41 Å. The B(4)-O(5) bond length is 1.36 Å. In the fifth B site, B(5) is bonded in a trigonal planar geometry to one O(1), one O(12), and one O(14) atom. The B(5)-O(1) bond length is 1.35 Å. The B(5)-O(12) bond length is 1.38 Å. The B(5)-O(14) bond length is 1.40 Å. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one K(1), one Al(1), and one B(5) atom. In the second O site, O(2) is bonded in a single-bond geometry to one O(8) atom. The O(2)-O(8) bond length is 1.24 Å. In the third O site, O(3) is bonded in a 2-coordinate geometry to one K(2), one Al(1), and one B(2) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one K(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one K(2), one Al(1), and one B(4) atom. In the sixth O site, O(6) is bonded in a water-like geometry to one K(1) and one K(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one K(1), one Al(1), and one B(1) atom. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one K(1), one K(2), and one O(2) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one K(2), one B(1), and one B(3) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one K(2), one B(1), and one B(2) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one K(1), one B(2), and one B(3) atom. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one K(2), one B(3), and one B(5) atom. In the thirteenth O site, O(13) is bonded in a bent 120 degrees geometry to one K(1), one B(3), and one B(4) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 120 degrees geometry to one K(1), one B(4), and one B(5) atom.