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By Dieter Schwarzenbach

This publication offers an intensive knowing of the data contained in crystallographic info records and of the functions of x-ray diffraction tools. the writer describes the history of theoretical and useful points from a geometrical standpoint. quite a few, conscientiously ready figures supply scholars with a transparent illustration of hitherto missed yet highly very important parts of the topic.

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The principal and satellite reflections under multiple-wave conditions, need to be considered. (3) Multi-block monolithic crystals: Wavevector-coplanar multiple-wave diffraction can take place in a multi-block monolithic crystal, given that the crystal is properly prepared and the wavelength is correctly chosen. As described in Sect. 2, all the diffracted waves, including the incident wave, lie in one plane for a given specific wavelength. This makes the preparation of a monolithic crystal with several blocks for coplanar multiple-wave diffraction possible.

For two-dimensional lattices, there are 4 plane lattices and 17 plane groups [404]. For quasi-crystals, the lattices are formed by the projection of periodic structures in a hyper-dimension onto three-dimension or lower ones and consist of two different types of unit cells. Therefore, the point group and space group of quasi-crystals are much more complicated than that of traditional crystals. The Fourier transform of a crystal lattice is the reciprocal lattice, in which a set of atomic planes is represented by a reciprocal lattice point.

The Bragg-Bragg case can be easily identified by detecting the presence of the secondary Bragg reflected beam for (311). If no diffracted intensity is detected at this 'lj; position, then this three-wave case is a BraggLaue diffraction, because the secondary reflected beam transmits through the crystal. The angular position at which the detector should be put can be easily determined from the diffraction geometry shown in Fig. 3 [414]. If the reciprocal lattice point L of the secondary reflection lies in the equatorial circle of the Ewald sphere (see Fig.

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