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Zur Kristallstruktur von Natriumnitrat
Published/Copyright:
August 25, 2010
Abstract
From exact intensity measurements of the X-ray reflections on NaNO3single-crystal-plates was derived by difference-Fourier- and least-squaresmethods that the NO3−-ions form flat pyramides. In the hexagonal cell the oxygen atoms are shifted in z-direction by 0.1 Å and turned round the 3-fold axis by the angle of 2.6° from the special position in the calcit structure. The N–O-bondlength is increased from 1.217 Å to 1.254 Å. There are two possible positions for the oxygen atoms which are connected by the 2-fold axis. They are occupied statistically and so the space-group R[unk]c must not be changed. During the shift the distances of the oxygen atoms to their neighboured Na+-ions remain nearly constant.
Published Online: 2010-08-25
Published in Print: 1978
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