THE SPACE-GROUP OF POTASSIUM DITHIONATE

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Abstract
An X-ray investigation of the space-group of potassium dithionate is described.Approximate measurements of refractive indices and specific rotatory power were in harmony with those obtained by Groth. From Laue photographs and the fact of optical activity, the crystal class is trigonal trapezohedral, in agreement with crystallographic data.The crystals showed the single cross and circular concentric rings characteristic of uniaxial crystals when plates perpendicular to the c axis were examined under crossed Niçois in convergent polarized light. The sign of the double refraction as determined with a quarter-wave plate was positive.The primitive translations of the unit cell, determined from the a axis and c axis rotation photographs were: a0, 9.77 Å; c0, 6.28 Å, and a:c = 1:0.644. The number of molecular units per cell was found to be three. It is deduced that the lattice must be hexagonal (Γh.) From the fact that no abnormal spacings of {0001} were observed, the space-group of potassium dithionate is shown to be either [Formula: see text] or [Formula: see text].

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