X-ray Diffuse Scattering by Single Crystals of Cubic Tetranitromethane. Part II
Open Access
- 1 January 1950
- journal article
- Published by The Crystallographic Society of Japan in X-RAYS
- Vol. 6 (1) , 27-32
- https://doi.org/10.5940/jcrsj1940.6.27
Abstract
For the x-ray diffuse scattering from cubic tetranitromethane crystals (α=7.08 A, Z=2, T3α-I43m), in which the molecules are in a statistical arrangement, here is given a tentative explanation' taking into account the short-range order. While actually the molecules possess the symmetry of S4-4, it was assumed for the sake of simplicity that the molecules had the symmetry of D2α-42m and took their molecular axes, the four fold rotation reflection ones, in equal proportions, to each of the three directions of the principalX, YandZaxes, the C-N bonds being parallel to the body-diagonals. It was observed experimentally that the diffuse maxima appear around the reciprocal lattice points whose indices areh+k+l=2n. This fact could be explained by an intensity formula for the diffuse scattering with a certain value of the parameter α, which measures the probability that for a given orientation of one molecule, its neighbour takes one of the three orientations.Keywords
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