Abstract
KIO3, M r = 214.001, R3 (refinement preferred with O atoms at x, y, z; rather than x, x, z required for R3m), a = 4.4973 (1) A, ~ = 8 9 . 2 1 8 ( 2 ) °, V = 90.94 (1) A 3, Z = 1, On(300 K ) = 3.89, Dx= 3 .91gcm -3, neutron powder diffraction (Rietveld method), 2 = 1.384 (1) A, F(000) = 80, T = 523 K, R t = 7.79% for 183 integrated Bragg intensities. The room-temperature triclinic (pseudo-rhombohedral) phase III structure transforms to the rhombohedral (pseudo-cubic) phase I structure by displacements of K and I atoms by approximately 0.1/~, O atoms by approximately 0 .2A, and the slightly distorted IO 3 groups in phase III become regular about threefold symmetry axes in phase
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