Abstract
A single-crystal study of chromium potassium alum has been made by neutron diffraction, thus completing the structure first indicated by the X-ray investigations of Lipson & Beevers (1935). Hydrogen bonds link the oxygen atoms within the water molecules to other oxygen atoms in the structure. In each case the angle HOH for a water molecule is about 106°, although this sometimes entails appreciable displacement of the hydrogen atoms from the direct O—O line. Large thermal vibrations of the oxygen atoms in the sulphate groups are noteworthy.
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