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The crystal structure of KAsF6

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International Union of Crystallography
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Abstract

The crystal structure of KAsF6 SHORT COMMUNICAT IONS 739 Acta Cryst. (1955). 8, 739 The c rys ta l s t ruc ture of KAsF6 . By RAYMOND B. ROOF JR., Mineralogical Laboratory, University of Michigan, Ann Arbor, Michigan, U.S.A. (Received 2 May 1955 and in revised form 1 July 1955) Potassium arsenic hexafluorine is the first of an ex- tensive series of arsenic-fluorine compounds being pre- pared for investigation by the Chemistry Department at the University of Michigan. The purpose of the investiga- tion of the crystal structure of KAsF e was to establish the interatomie distance between As and F and to examine the role of K in the bonding of the crystal. Minute single crystals were grown from a water solution and these crystals exhibited the symmetry 3. Weissen- Table 1. Comparison of observed and calculated powder line intensities (Cu K0~ radiation) Line No. 0 (o) hb.l 1 9.2 10.1 2 12.1 11.0 3 14-1 01.2 4 15.3 02.1 5 18.7 00.3, 20.2 6 19.7 21.1, 33.1 7 21.3 30.0 8 22.6 12.2, 11.3, 12.3, 13.2 9 24.8 22.0 10 26.1 10.4 11 26-7 13.1, i4.1 12 29.0 4i.2, 03.3, 31.2, 30.3, 02.4 13 32.0 04.2, 22.3, 21.4, 31.1 14 32.6 32.1, 53.1 15 33.7 41.0, 14.0 16 34.6 23.2, 35.2, 01.5 17 35.5 20.5 18 37.4 05.1, 13.4, 14.4 19 39.0 33.0, 12.5, i3.5 20 39.8 00.6, 50.2, 41.3, 14.3 F~p F~p 30 25 69 82 72 61 27 33 27 30 15 8 21 19 228 285 48 67 24 25 42 34 105 113 198 155 24 28 78 72 81 69 15 18 54 36 63 86 90 97 berg photographs established the space group as R3. The hexagonal unit cell lattice constants are a = 7.352, c = 7.235 ~. From a measured density of 3.29 g.cm. -a the number of formula weights per unit cell was determined as Z ---- 3. Intensi ty measurements were made by a photodensito- meter trace of a powder photograph of the material which was taken with Cu Ks radiation. Table 1 compares the observed and calculated powder line intensities. The observed intensities

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