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The charge-density distribution in V2O3 differs from that in Ti2O3 mainly with respect to the deformation of the metal atoms. The V atoms show a positive deformation of up to 0.1 e A-3 perpendicular to c in a plane containing three nearest V-atom sites across the edges of the surrounding O-atom...
Bright-field lattice images of three syntactically coalesced polytypes of SiC were taken with a view to deriving structural information. A high-period structure 400H is found to consist of seven unit cells of 150R and one unit cell of 150RA. The 150R structure is built up of ten 15R unit cells;...
Crystals of the protein B-phycoerythrin from the red alga Porphyridium cruentum undergo twinning by merohedry in which the two members of the twin are related by rotation about (1,1,-1,0), a symmetry operation of the lattice but not of the crystals. Several methods are compared for estimation of...
It is shown, by electron diffraction and high-resolution microscopy, that AuCu II is a typical example of an irrational long-period alloy, contrary to Ag3Mg, for instance, which is a typical rational long-period alloy. Antiphase boundaries are not planar (as is the case for Ag3Mg) but rather...
Derivative lattices are related to one another by transformation matrices having rational elements. A simple algorithm for finding these matrices consists in testing if the scalar products of the vectors defining two arbitrary primitive cells of two lattices can be exactly or approximately...
The theory described in the previous paper Kato (1980). Acta Cryst. A36, 763-769 has been applied to calculating the intensity distribution in the topography of statistically homogeneous crystalline media. The integrated intensity for parallel-sided crystals is also presented. The formulae cover...
A method is presented for calculating standard deviations of Cremer-Pople ring-puckering coordinates.
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