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In the present article (i) a new formula for the single-crystal rocking curve for both the centrosymmetric and polar Bragg case is given; (ii) a geometrical construction is derived, whence many properties of the rocking curve are easily visualized; (iii) the different analytical expressions...
Measurement and theoretical estimate of the anharmonic non-quadratic contribution to the Debye-Waller factor for NaCl are reported. For the experiment the Mossbauer -ray diffraction technique was used to find the elastic diffracted intensity separated from the thermal diffuse scattering. The...
Comment on the preceding Short Communication.
By comparing the crystal structure (investigated by means of X-ray diffraction) and the birefringence of disordered ZnS crystals it is shown that the birefringence n is proportional to the hexagonality , i.e. n = . nWurt. The hexagonality is the part of hexagonal packing elements, nWurt the...
Corrections to a previous paper Acta Cryst. (1970). A26, 349 are given.
Various mechanisms for polytypic growth in zinc sulphide crystals have been discussed. It has been pointed out that the polytypic growth in this compound is the result of the ordering of f.c.c. microtwins along the <111> directions. A comparison between the structures actually found and those...
A neutron diffraction study was made of the 222 reflection of germanium and silicon between the temperatures of 25 and 500 DegreesC. Care was taken to reduce effects of simultaneous and higher order reflections. Extinction effects were considered, as nearly perfect crystals were employed in the...
The integrated intensity of the lines 550 and 712 from a chromium powder sample was measured at 310.2 and 313.2DegreesK, that is below and above the Neel temperature. From the difference in the integrated intensity of each line and after correction for thermal diffuse scattering, it was found...
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