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Any cubic crystal structure can be divided into small units in the form of congruent semi-regular (Archimedean) truncated octahedra. The centers of these polyhedra can be chosen at invariant equivalent positions for most cubic space groups. The part of a crystal structure enclosed by an...
Lattice imaging with tilted illumination at the 2.5 A level has been used for the direct determination of stacking sequences in silicon carbide polytypes by observation of electron micrographs. The method employed is first demonstrated by observations of the common short-period polytypes 3C, 4H,...
Two procedures are described to extend and refine phases starting from a medium-sized set of known phases. From tests with 376 and 400 atom structures it was found that for extension purposes the tangent formula is suitable; for refinement purposes the tangent formula was adapted in order to...
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