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The optical interferometric technique has been used to examine liquid crystalline surfaces. Topographs are given of stepped and faceted drops. Some new surface features of the smectic and cholesteric phases are also presented. The nematic phase gives fringe contours similar to those of the...
A direct method for the determination of polytype structures of SiC, ZnS and similar substances from X-ray data is described. It is based on the values of a Patterson-like function (the `Pattersonian') which only depends on the stacking of the translationally equivalent layers of the structure....
An analysis is given of the relation between the reduced cells defined by Niggli and the cells obtained by applying Buerger's algorithm. It is shown that in many instances a cell based on the shortest three non-coplanar translations must be transformed to obtain the reduced cell. The required...
The structure factors measured by the participants in the single-crystal intensity project of the IUCr. Commission on Crystallographic Apparatus on D(+)-tartaric acid have been used in least-squares refinement of the structural parameters. The structure factors submitted by each participant were...
The potential energy in molecular crystals of -nitrogen, cyanogen and octachlorocyclobutane is calculated as a function of the unit-cell parameters. Some available potential functions for nitrogen-nitrogen and chlorine-chlorine interactions between non-bonded atoms are tested. The results show a...
The measurements of the Debye characteristic temperatures and mean-square vibrational amplitudes u2 of gold in the temperature range from 300 to 1150DegreesK are presented. All data were determined from the X-ray integrated intensities of a gold single-crystal. The room temperature value = 188...
The negative coefficient of thermal expansion parallel to the tetragonal axis of indium at room temperature is interpreted in terms of the elastic properties of the lattice. A suggestion that the negative thermal expansion implies a negative linear compressibility in the same direction is refuted.
It is found that absorption of X-rays by the target material can result in beam inhomogeneities of more than 30% at low take-off angles.
A periodic polytype 66R was found to constitute part of a ZnS crystal. Oscillation photographs were taken with Cu K radiation. A test was applied to these data showing that the crystal was better approximated by the assumption of a perfect crystal (I ~ |F|), than by that of a mosaic crystal (I ~...
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