Diffraction peak width

In the concepts developed above, we have used the kinematic approximation, which is valid for weak diffraction intensities arising from imperfect crystals. For perfect crystals (available thanks to the semiconductor industry), the diffraction intensities are large, and this approximation becomes inadequate. Thus, the dynamical theory must be used. In perfect crystals the incident X rays undergo multiple reflections from atomic planes and the dynamical theory accounts for the interference between these reflections. The attenuation in the crystal is no longer given by absorption (e.g., p) but is determined by the way in which the multiple reflections interfere. When the diffraction conditions are satisfied, the diffracted intensity ft-om perfect crystals is essentially the same as the incident intensity. The diffraction peak widths depend on 26 m and Fjjj and are extremely small (less than... 

Figure 2. Use of diffraction peak widths and areas to determine average Pt crystallite size and weight percent Pt in a supported metal catalyst.

V. Ji, Y.C. Zhang, C.Q. Chen, The non-destructive estimation of the superficial mechanical properties of components in the INCONEL 600 alloy by X-ray diffraction peak width. Surf. Coat. Technol. 130 (2000) 95-99. 

The size L of the coherent fields can be calculated from the diffraction peak width halfway up, using the Scherrer formula ... 

Ethylene DSC, SAXS, and X-ray diffraction I was linear LLDPE and II was HDPE co-crystallization was evidenced by a single by DSC stated that X-ray diffraction peak width, SAXS and Raman spectra were all consistent with a single crystallizing species but for HDPE/LDPE and LLDPE/LDPE, separate crystals were seen with two being found by DSC Stein et al. (1989)... 

The effect of calcination temperature on the phase composition and crystallinity of the HA powders is illustrated in Fig. 1. All the powders resulted in diffraction peaks that only corresponded to HA. The XRD trace indicated that for calcination temperature at 700°C, broad diffraction peaks were obtained that was similar to the diffraction patterns obtained for the untfeated powder. Nevertheless, there was a clear change in the diffraction peaks (width and height) when the calcinations temperature increases beyond 700°C. This observation indicated that increasing the calcination temperature results in higher crystallinity of the starting powder. 

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