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The general systematic procedure is described for determining the magnetic space group (Shubnikov group) of a crystal from the magnetic point symmetry found from nuclear magnetic resonance data (Heesch, standard representation) and the crystallographic structure. The aspect group, which is the...
Accurate integrated intensities for the Bragg reflexion of neutrons from BaF2 have been measured at various temperatures in the range 20-600DegreesC and corrections for the effects of both thermal diffuse scattering and extinction have been applied. The experimental data show systematic...
In a triclinic system, the squares of reciprocal spacings of any seven linearly independent X-ray powder lines which belong to the same lattice fulfill a Diophantine equation containing their Miller indices, which involves a 7 x 7 determinant. This can be expanded in minors which are integers....
Jahn's method of reduction of a representation has been applied and extended to obtain the fourth order and the fifth order elastic coefficients for the 32 classes of crystals.
The relationship of the resolution function of a conventional two-crystal diffractometer for elastic scattering to the resolution function of a three-crystal diffractometer is discussed. An analytic expression is derived for its form assuming Gaussian mosaic and collimation angles and the...
Accurate electron density maps for the study of chemical bonding and thermal motions in crystals can be obtained only if the integral Bragg intensities are corrected for absorption, extinction, thermal diffuse scattering etc. This can be done by careful studies of the photographically observed...
A new approach to the kinematical theory has been developed for the case of binary alloy solid solutions with short-range ordering of the atoms and displacements of the atoms from the average lattice sites due to departures of the effective atomic radii from the average for the alloy. Both the...
In an attempt to describe quantitatively the distribution of X-ray diffraction maxima, previously treated on a mainly phenomenological basis by Andrews (chapter 20 of Peiser, Rooksby & Wilson: X-ray Diffraction of Polycrystalline Materials. London: Chapman & Hall, 1960), the radial frequency...
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