Abstract
An X-ray diffraction study of α-HIO3 crystal has been performed with the following results: sp. gr. P212121, Z = 4, a = 5.5360(3) A, b = 5.8723(6) A, c = 7.7291(5) A, and R factors R(F)/wR(F) = 0.86/0.69%. Disordering of iodine site is revealed, which is described in terms of anharmonic atomic displacements. Packing (likely unique) of all structure atoms over two systems of planes rotated by an angle close to the rotation of optical axes (47°) is revealed. The rotation of the plane of polarization of light based on the structural data is calculated for the first time for the α-HIO3 crystal.
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