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The iterative procedure of phase determination in direct methods is considered as a filtering process. The use of different filter transforms for more effective filtering is proposed. The eigenvector transform for optimal extraction of reliable structure information from approximate densities is...
A study has been made of the crystal structure and electron density distribution of (CD32(OH)C-CC-C(OH) (CD3)2 by X-ray diffraction at 90 K. The intensities were measured with monochromatized Mo radiation (graphite monochromator) on a CAD4 diffractometer with the /2 step-scan technique, (sin )/...
The 'pure' ferroelastic behaviour of P-rich Pb3(PxV1 - xO4)2 is of the improper type. The ferroelastic phase transition is antiferrodistortive and accompanied by a second one at a lower temperature. The temperature range of the intermediate phase is approximately 20DegreesC. At the transition...
Molybdenum K X-radiation, monochromated by an NaCl single crystal, was scattered in 1-propanol at -25DegreesC. The angular distribution of the scattered X-ray intensity was determined and used for the calculation of the experimental pair function. On the basis of some models of the structure of...
Integrated intensity measurements depend on the wavelength range of integration. In conventional X- ray measurement procedures this range decreases with increasing diffraction angle, which results in a systematic intensity error for which normally no correction is applied. This paper presents an...
It is pointed out that II, as defined by Iwasaki & Ito Acta Cryst. (1977), A33, 227-229 is equal to SK, as defined by Stewart & Karle Acta Cryst. (1976), A32, 1005-1007, multiplied by L, the multiplicity of the chosen unit cell relative to a primitive one, i.e. II = SKL.
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