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The authors' work on the lattice complexes of plane groups is related to the earlier publications of N. L. Smirnova and her co-workers.
X-ray diffraction patterns from a polycrystalline material or a small distorted crystal do not always contain enough information for the determination of the (average) geometry and the degree of distortion of the crystal(s). To avoid the consequent difficulties in the interpretation of...
Spectroscopically pure Cu has a lattice parameter a25 = 3.61491 A (corrected for refraction), and a thermal expansion coefficient = 14.87 x 10-6DegreesC-1 between 15 and 55DegreesC. The measured density d25 is 8.9314 plus or minus 0.0002 g.cm-3 in agreement with the calculated value dx = 8.9316....
X-ray diffraction measurements have been made of the intensities of Bragg reflexions from a single-crystal of MgO which had been neutron irradiated in order to overcome the effects of extinction. Least-squares refinement of the data in terms of a number of spherical `prepared' models shows that...
A calculation of the incoherent scattering by bromine has been made by use of the Waller-Hartree formulation including electron exchange and Hartree-Fock-Slater wave functions.
The determination of real one-dimensional representations of a group is equivalent to the determination of its invariant subgroups of index two. This idea is used to construct and classify the magnetic space groups.
Analytic constants for atomic scattering factors for use with Cu K and Mo K radiation have been calculated for the elements of atomic numbers 1-100, based on the scattering factors of Hanson, Herman, Lea & Skillman (Acta Cryst. (1964) 17, 1040).
The structure factor is shown to be a basis for a one-dimensional representation of the point group, and the following property of non-primitive translations of most of the space groups is derived: the sum of non-primitive translations is a primitive one.
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