KIO3 crystallizes in the trigonal R3 space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(7), and one O(8) atom. In the second K site, K(2) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(4), one O(6), one O(7), and one O(8) atom. In the third K site, K(3) is bonded in a 12-coordinate geometry to three equivalent O(2), three equivalent O(4), three equivalent O(5), and three equivalent O(7) atoms. In the fourth K site, K(4) is bonded in a 12-coordinate geometry to three equivalent O(1), three equivalent O(3), three equivalent O(6), and three equivalent O(8) atoms. There are eight inequivalent O sites. In the first O site, O(7) is bonded in a 1-coordinate geometry to one K(1), one K(2), one K(3), and one I(2) atom. In the second O site, O(8) is bonded in a 1-coordinate geometry to one K(1), one K(2), one K(4), and one I(1) atom. In the third O site, O(1) is bonded in a 4-coordinate geometry to one K(2), one K(4), one I(3), and one I(4) atom. In the fourth O site, O(6) is bonded in a 1-coordinate geometry to one K(2), one K(4), and one I(4) atom. In the fifth O site, O(2) is bonded in a 2-coordinate geometry to one K(1), one K(3), and one I(4) atom. In the sixth O site, O(3) is bonded in a 1-coordinate geometry to one K(1), one K(2), one K(4), and one I(3) atom. In the seventh O site, O(5) is bonded in a 3-coordinate geometry to one K(1), one K(3), and one I(3) atom. In the eighth O site, O(4) is bonded in a 1-coordinate geometry to one K(1), one K(2), one K(3), and one I(4) atom. There are four inequivalent I sites. In the first I site, I(1) is bonded in a 3-coordinate geometry to three equivalent O(8) atoms. In the second I site, I(2) is bonded in a 3-coordinate geometry to three equivalent O(7) atoms. In the third I site, I(3) is bonded in a 3-coordinate geometry to one O(1), one O(3), and one O(5) atom. In the fourth I site, I(4) is bonded in a 3-coordinate geometry to one O(1), one O(2), one O(4), and one O(6) atom.
KIO3 crystallizes in the trigonal R3 space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(7), and one O(8) atom. The K(1)-O(2) bond length is 2.76 Å. The K(1)-O(3) bond length is 2.97 Å. The K(1)-O(4) bond length is 2.90 Å. The K(1)-O(5) bond length is 2.80 Å. The K(1)-O(7) bond length is 2.79 Å. The K(1)-O(8) bond length is 2.97 Å. In the second K site, K(2) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(4), one O(6), one O(7), and one O(8) atom. The K(2)-O(1) bond length is 2.76 Å. The K(2)-O(3) bond length is 2.92 Å. The K(2)-O(4) bond length is 3.02 Å. The K(2)-O(6) bond length is 2.81 Å. The K(2)-O(7) bond length is 2.98 Å. The K(2)-O(8) bond length is 2.78 Å. In the third K site, K(3) is bonded in a 12-coordinate geometry to three equivalent O(2), three equivalent O(4), three equivalent O(5), and three equivalent O(7) atoms. All K(3)-O(2) bond lengths are 3.25 Å. All K(3)-O(4) bond lengths are 3.16 Å. All K(3)-O(5) bond lengths are 2.94 Å. All K(3)-O(7) bond lengths are 3.35 Å. In the fourth K site, K(4) is bonded in a 12-coordinate geometry to three equivalent O(1), three equivalent O(3), three equivalent O(6), and three equivalent O(8) atoms. All K(4)-O(1) bond lengths are 3.17 Å. All K(4)-O(3) bond lengths are 3.19 Å. All K(4)-O(6) bond lengths are 2.94 Å. All K(4)-O(8) bond lengths are 3.37 Å. There are eight inequivalent O sites. In the first O site, O(7) is bonded in a 1-coordinate geometry to one K(1), one K(2), one K(3), and one I(2) atom. The O(7)-I(2) bond length is 1.82 Å. In the second O site, O(8) is bonded in a 1-coordinate geometry to one K(1), one K(2), one K(4), and one I(1) atom. The O(8)-I(1) bond length is 1.81 Å. In the third O site, O(1) is bonded in a 4-coordinate geometry to one K(2), one K(4), one I(3), and one I(4) atom. The O(1)-I(3) bond length is 1.81 Å. The O(1)-I(4) bond length is 2.64 Å. In the fourth O site, O(6) is bonded in a 1-coordinate geometry to one K(2), one K(4), and one I(4) atom. The O(6)-I(4) bond length is 1.82 Å. In the fifth O site, O(2) is bonded in a 2-coordinate geometry to one K(1), one K(3), and one I(4) atom. The O(2)-I(4) bond length is 1.81 Å. In the sixth O site, O(3) is bonded in a 1-coordinate geometry to one K(1), one K(2), one K(4), and one I(3) atom. The O(3)-I(3) bond length is 1.82 Å. In the seventh O site, O(5) is bonded in a 3-coordinate geometry to one K(1), one K(3), and one I(3) atom. The O(5)-I(3) bond length is 1.82 Å. In the eighth O site, O(4) is bonded in a 1-coordinate geometry to one K(1), one K(2), one K(3), and one I(4) atom. The O(4)-I(4) bond length is 1.82 Å. There are four inequivalent I sites. In the first I site, I(1) is bonded in a 3-coordinate geometry to three equivalent O(8) atoms. In the second I site, I(2) is bonded in a 3-coordinate geometry to three equivalent O(7) atoms. In the third I site, I(3) is bonded in a 3-coordinate geometry to one O(1), one O(3), and one O(5) atom. In the fourth I site, I(4) is bonded in a 3-coordinate geometry to one O(1), one O(2), one O(4), and one O(6) atom.